WARNING: kind of BDSM-ish. Features bondage and safe-words.

Part XVIII

6x21 The Closure Alternative

Sheldon: You don't know what it's like to feel completely frustrated. To have a desire build up within you and be denied any opportunity for release.

Amy: Yeah, sounds like a drag.

The feeling of release washed over him as he lay on the ground – groaning in ecstasy. Did Penny come in? He couldn't recall what happened. He basked in euphoria for another minute.

It felt even better now. Closure.

Closure on all the experiments Amy had subjected him to during the day. The Jack-in-the-Box. The National Anthem. The birthday cake. The tic-tac-toe. The dominoes.

Release had never felt as good as it did now. It turned out the waiting helped. He should remember that when he planned his revenge. If Amy thought she could get away with this, then she had a whole other thing coming. She started a dangerous game she sure as hell was not going to win. Because Sheldon Cooper didn't play to get even.

He played to win.

He had planned it perfectly. Their next date night, on a Thursday obviously, would be at her apartment. He spent a lot of time reading up on the subject matter. Sheldon wasn't one to go into a test unprepared, especially not one of such importance as this one.

"Hello Sheldon," Amy greeted him with a big smile as she answered the door.

"Hello," he said, hardly containing his grin. She wouldn't be smiling like that once he was through with her. He'd make sure of it.

He entered her apartment, and carefully took off his messenger's bag containing the supplies for later. Amy was putting the finishing touches on their dinner in the kitchen. Sheldon's eyes moved over her form. Cardigan, blouse, top, skirt, tights, shoes. She was wearing her usual attire of way too much clothes for the Californian weather.

They talked about work over dinner; the tenure committee was still undecided who would be given tenure. At least Sheldon had made amends with Mrs Davis. He supposed he had Amy to thank for that; she made him see that is behaviour needed modifying.

She may have been right about that one, but her downright cruel experiments a week ago had been uncalled for. Never before had he felt this level of frustration. It ate him up inside. It made his heartrate increase to a level of becoming problematic, his palms sweaty, and caused a constricting feeling in his gut.

Had she any idea what she had done to him? It was almost sadistic, how she seemed to enjoy his discomfort.

She hadn't even given him an out of sorts. A get-out-of-jail-free-card, as it were. He just had to endure, endure and endure it, without knowing if he would ever be able to experience the release he so desperately craved. Just who did she think she was? Just because she had a doctorate in neurobiology, did not mean she could just toy with him like this.

Oh, his revenge was going to be very sweet indeed.

"Would you like more cobbler?" Amy asked. She had cooked for him, and everything was delicious. It almost made him feel bad about his plans.

"No, thank you," he said.

They drank their tea in silence. It was still rather early; he had at least two and a half hours before their date night would end. That should be more than sufficient, according to his research.

"So," Amy said after a while. "You said before you had something planned for tonight?"

"As a matter of fact, I do," Sheldon said. He felt his heartrate increase. It was rather… unorthodox, his plan for her. But it was by no means worse than what she had done to him with her experiment.

He was just giving her a taste of her own medicine.

Amy gave him a questioning look. "Well, what is it?"

"A week ago, you experimented on me, to see if you could help me with my 'need for closure'," he said, making air-quotations as he said it.

Amy beamed. "Yes, I remember."

"It made me think," Sheldon said, holding her gaze steadily, "whether you would able to succeed in such an experiment."

"But you did succeed, Sheldon," Amy said. "I'm really proud of you."

Sheldon scoffed. Apparently she didn't know him at all. "I did not succeed, Amy," he said, condescendingly. "The minute you left, I repeated all experiments again and that time to completion."

Amy looked slightly disappointed. "Oh."

"So," Sheldon cleared his throat. He didn't like it when Amy looked at him with that disappointing look. "Do you think you'll do better?"

Amy gave him a slightly confused look. "But I don't really have a need for closure," she said.

We'll see about that, Sheldon thought.

"Well, in that case… you probably don't object to participating in a similar experiment I have designed for you?"

Amy's entire face lit up.

"Oh, I love doing experiments! What hypothesis are we testing?" Amy exclaimed enthusiastically. She looked like a kid in a candy store.

Sheldon felt his neck heat up. "I believe that your need for closure is as big, if not bigger, as mine," he stated, hoping his voice didn't waver.

"Interesting hypothesis."

"Yes, I believe so."

They were silent for a while. Amy blinked at him.

"Alright, I think it will be disproven. But I'll let you try to confirm your hypothesis," Amy said. "Tell me, what does the experiment entail?"

Sheldon had been afraid of this. Of course Amy was familiar with the rules on experimenting; forming hypotheses; H0 and H1, and then designing a set of experiments to see which of the hypotheses held.

"In the interest of the experiment, it's best that the subject doesn't know too much beforehand," he said. "It might tamper the results."

Amy's eyes twinkled. "Colour me intrigued, Doctor Cooper," she said with that voice that caused tingles to go down his spine.

"Alright," Sheldon said. He tried to sound authoritative. He cleared his throat. "In preparation for the experiment, I'd like to ask you to use the bathroom if you feel the need, and drink a glass of water."

"Will it take long, this experiment?" Amy asked, taken aback.

"That really depends on your need for closure, if it turns out you don't have a need for closure as you claim, then it might take a really long time, yes."

Amy's brow furrowed. "Alright," she said, trying to figure him out.

Amy moved to the bathroom to take care of some business. Sheldon breathed out deeply. He had almost given his plan away now. He shouldn't have said so much. She would figure him out the minute he'd put his plan into action. He moved to the kitchen to wash his hands thoroughly. He then grabbed his messenger's bag and moved to Amy's room.

Amy looked up in surprise when she saw him, seated on the foot of her bed.

"We're doing the experiment in my bedroom?" she asked.

"We are," Sheldon said. "Please, take off your shoes and cardigan."

Amy stared at him for a beat. Her mouth had dropped open in apparent shock. She knew better than to ask though; if she knew too much, the results would be tampered. Sheldon watched as she toed off her shoes and unbuttoned her cardigan.

"Before we start, I'd like to establish some rules in regards to the experiment," Sheldon said. This part was essential. While he read up on what he was about to do, every forum and every website had been clear on this part.

This needed to be established beforehand. And it had to be clear for both parties.

Amy folded her cardigan, an action he regarded with a small smile, and gave him a questioning look.

"Sure," she said. "Do I need to sign a waiver?"

She laughed, as if it was a joke. "No, no need for waivers," Sheldon coughed. "It's just that, when you experimented on me, you gave me no way of letting you know that you were going too far in your experiment. Now, before you say you can just tell me to stop the experiment, I think that isn't going to be sufficient here."

"I'm a scientist, Sheldon," Amy said. "And I don't think I have such a pathological need for closure as you do. I think I'll be able to handle whatever you have planned for me."

"Regardless of your scientific prowess and your confidence in your own abilities, I'd like to ask you to come up with a codeword to use when you want to stop the experiment," Sheldon spoke clearly.

Amy blinked.

"A codeword. You mean like a safe word?" Amy asked, her face flushed and her voice wavering.

"If you want to call it that, sure."

Amy was fully blushing now, and Sheldon suppressed a chuckle. She was probably embarrassed because of where her mind was going with this, but little did she know she wasn't far off.

Amy looked around her bedroom. Her eyes rested on her copy of Pride and Prejudice on her nightstand. "Ehm… Like 'Darcy'?" she asked.

Sheldon shrugged. "Alright. If you say Darcy, I will cease the experiment immediately."

"Okay," Amy said, looking at him suspiciously now.

Sheldon nodded and got up from the bed. He busied himself with his bag. "Go ahead, and get comfortable," he said, indicating to the bed.

He gave her a couple of seconds to get on the bed. He turned around, the rope neatly folded and still invisible in his hands. Amy was seat in the middle of the bed, her hands hugging her knees. She gave him a look, smiling at him.

"I must say, Sheldon, I'm really curious what this experiment will entail," she said, looking like he himself looked before getting on a rollercoaster; curious, excited and apprehensive.

"You will find out soon enough," he said. "Now, lay back."

She did. Her head rested on her pillow. "Like this?" she asked.

Sheldon's eyes roamed over her body. "Yes," he answered. "Now lift your arms."

Amy's eyes crinkled in confusion. Sheldon raised an eyebrow at her. Her arms moved upwards, slowly and shaking a little.

He walked over to her, and climbed on his knees on the bed next to her torso. He had practiced the knots at home. He took hold of her right wrist, her pulse was already elevated.

Quickly and efficiently, he looped the rope around her wrist. Amy inhaled sharply. He secured the rope through the bars of her headboard. He grasped her other wrist and tied her left hand with the other end of the rope. She wasn't completely immobile like this, but she surely wasn't able to move around a lot.

Amy gaped at him.

"Did you just tie me to my bed?" she said, incredulously but a little breathless.

Sheldon gave her a look. What else could it possibly be? "I did," he confirmed.

Amy was blushing fully now. Or she was just really warm. Her wrist had felt warm. Sheldon's eyes moved over her again. Her blouse had ridden up; the buttons were pulled tight across her chest, and the camisole she wore underneath it was visible between the blouse and the top of her skirt.

"This looks uncomfortable," Sheldon said, indicating to her blouse. "You're also looking rather flushed. Maybe I should unbutton some of these?"

He could see Amy gulp. "Sure," she mumbled. She looked apprehensive.

Sheldon took a seat next to her. He let his eyes wander over her form. Amy seemed to squirm on the bed already.

He looked at her eyes again. Her pupils had dilated.

Sheldon slowly moved his hand to her blouse, and started to unbutton the top buttons. The backs of his fingers grazed against the exposed skin on purpose. She felt warm to the touch. Amy breathed in slowly.

"I think I'll have you begging me for closure in fifteen minutes, Amy," Sheldon whispered, almost threateningly. He was opening all the buttons, his fingers grazing her camisole now.

Amy raised her eyebrows at him. "When are you starting the experiment?" she rebutted.

Sheldon looked at her sharply. Surely she understood they had already started?

"In a minute," he said instead. This was going to be harder than he thought.

Perhaps Amy was onto him. His scheme. She was almost daring him with the look in her eyes. Challenging him.

He was not going to have that. He was teaching her a lesson. Not to experiment on him like that ever again. And, if she did, she should give him an out. Like the codeword he had established with her. It had been torturous. Sadistic.

And if Sheldon excelled at one thing, it was sadism.

He bent forward slowly, moving into her. Amy stared at him with wide eyes as his face approached hers steadily. Her lips parted slightly. He could actually hear her hold her breath.

The last second he swivelled to the right and kissed her cheek instead of her lips. Amy gasped softly. He didn't pull back from her face, and pressed another kiss to her cheek, closer to her lips this time. And another, and another.

His right hand held her hip in a firm grip – she was squirming – as he continued to litter her face with tiny kisses. Amy gasped again.

"Sheldon," she whispered.

"Yes?" he asked, pulling away from her face.

She was looking at him uncomprehendingly. "Wh-what are you doing?" she asked.

"We've started the experiment, Amy," he simply answered.

Realisation flitted over her face. Sheldon raised an eyebrow at her; challenging her this time.

He leaned into her again; slowly, teasingly. Amy made a kind of whining noise, and he could only smirk in response. He would definitely have her begging for it later.

Sheldon pressed his lips to hers, fleetingly. He pulled away within the blink of an eye. It felt different than he remembered. But perhaps that was just because he was prepared for it this time; she had ambushed him both other times she kissed him.

He leaned into her; kissing her lips again. A little longer this time.

Amy gasped softly when he pulled away. He felt a twinge in his gut. It was different; the feel of her lips against his. He wanted to feel it again. Without checking Amy's eyes again – it confused him somehow, the way she looked at him – he leaned in again, pressing his lips against hers.

She kissed him back.

The twinges in his gut returned full force. Their lips moved over each other; hesitant and searching. Curious and testing. Soft and cataloguing.

He didn't know how long it lasted. But he had taken hold of her head with his left hand, holding her as he kissed her, while his right hand made slow caresses over her hip and side. Amy made soft little moans from time to time and it spurred him on.

It egged him on a little too much. The point of the experiment was to make her lose her mind, he was supposed to remain in control. Sheldon pulled away from her face, and he tried to read her expression.

Her cheeks were red, and her pupils seemed to dominate her eyes, she was breathing shallowly.

His fingers moved from her head down to her neck, feeling her pulse. It hammered under his fingertips.

"I think it's time for phase two of the experiment, don't you think?" he mumbled.

Amy only looked at him. She swallowed thickly.

Sheldon held her eyes while his right hand moved from its caresses on her side to the closure on her skirt. Her heart skipped a beat under his fingertips. He unbuttoned it and his fingers tugged down the zipper. Amy stilled.

He looked at her. He felt a little flushed himself. He was about to undress her. Really undress her. After the kissing just now, he wondered if he would be able to pull it all off. Kissing her had affected him. He hadn't expected that.

But he had a point to make.

Amy's mouth dropped open. He was on his haunches next to her now, tugging the skirt down past her hips. He folded it and laid it down on the foot of the bed.

He turned to her. His hands trembled a little when he grasped the waistband of her tights.

"Sh-Sheldon," Amy said, breathlessly.

He looked up at her. She seemed to be done talking, she only stared at him. Sheldon decided to power through; his fingers tugged her tights down and took her panties of simultaneously for good measure. He folded them both, without looking at her. His own heartrate was elevated now.

Sheldon looked her over. Amy was gaping at him. Her hands still tied to the headboard, her neck and cleavage flushed red, her camisole covering her tummy. She had drawn up her legs and tried to shield as much as possible, it seemed.

He wondered why she bothered. She had shown him all of it just a few months ago in the Caltech parking lot.

He started to caress her softly. His fingers moved over her ankles, and her calves. The inside of her knees; an erogenous zone according to Cosmopolitan magazine. She did inhale rather sharply when he caressed her there. He positioned himself on his knees in front of her, both his hands rested on her drawn up knees.

"Darcy?" he asked softly, checking in on her.

Amy shook her head firmly. Of course, she wouldn't be backing down either. This was almost turning into a game of one-upmanship.

He pushed her legs open, his eyes never leaving her face. He was going to make her eat her words. I don't have a pathological need for closure, her words echoed in his head. Taunting him.

He marvelled at the softness of the skin of her thighs, his hands caressing the inside slowly and almost gently as he moved his hands up her legs. Amy was looking at him incredulously. Did she think he wouldn't go through with it? He was wondering that himself as well.

But Sheldon Lee Cooper was no quitter. He needed the closure himself.

His eyes moved from her face downward. The legs he was holding open shook a little with nerves. His eyes roamed over her privates. There were no Band-Aids this time. He did wonder how long the hairs stayed away after waxing, because she looked pretty hairless to him. Amy squirmed under his gaze.

He moved his fingers over the inside of her thigh, inching closer every time and moving away at the last second. The squirming continued. Sheldon suppressed a smirk. She'd be eating out of the palm of his hand.

His fingers grazed the crease between her thigh and her pussy. Amy gasped.

He moved them away again, pushing up her camisole and stroking her abdomen instead. Amy wriggled on the bed. Her hands pulled on their bounds.

Sheldon could do this all day, he realised. Making her squirm like this. Giving her the illusion that he would touch her there and then leave her hanging the last second. Was this why Amy got such a kick out of him losing his mind over the closure experiments?

His hand moved between her legs, and he avoided the wet and glistening part of her. Amy was moving her hips now, trying to move them in the path of his hand it seemed. Sheldon chuckled darkly.

"Is something wrong, Amy?" he asked.

She glared at him. "No," she hissed.

"Hmm," Sheldon hummed. "You appear somewhat uncomfortable though... Is there anything I can do about that?"

He was loving this.

"Oh, I'm not uncomfortable," Amy said firmly, but she squirmed again when Sheldon moved his hand dangerously close to the part between her legs.

"If you say so," he said simply.

"Yes." Amy shot daggers at him. Sheldon just raised an eyebrow at her.

She was way too vocal to his liking. He caressed her teasingly for another minute – just until she got the idea that he wouldn't go through with it – and then, when she least expected it, caressed her there.

Amy gasped.

Sheldon was unprepared for the amount of wetness. Or the slipperiness. Or the heat.

He watched in wonder how his fingers moved over her, the slick skin. She was so wet. He had read about this of course, but he hadn't expected this. It caused a stirring in his pants.

Amy had her eyes closed now, and her squirming was getting annoying now. Sheldon held her hips down firmly with his left hand while he explored her folds with the other. Amy was gasping softly, but she gasped the hardest when he brushed over the hardened nub at the top of her labia.

"Yes," she breathed. The stirring in his pants worsened.

He moved his fingers lower, avoiding that part of her on purpose.

Amy whined. "Sheldon…" she groaned, pushing her hips up against his hand.

Sheldon teased her again, rubbing her clit a little, but never long enough for her to experience actual pleasure. Amy kept groaning in frustration, her hands pulling on the rope on the headboard. The power Sheldon felt coursing through him was unexpected and thrilling.

"How are you doing, Amy?" he asked wickedly.

Amy pulled on the bounds on her wrists, her back arching. Sheldon was in the middle of stimulating her clit again, and he slipped his finger lower when her breathing became to laboured.

Amy huffed. "I know what you're doing, Sheldon," she grumbled. Her hips moving against his hand again.

Sheldon chuckled. "And how does that make you feel?"

She was not amused. The look she gave him nearly made him back off. Until Sheldon caressed her clit again, making firm strokes against her. Her eyes rolled back inside her head. Sheldon grinned. This was amazing. Amy was completely at his mercy.

It was really arousing for some reason.

Her breathing hitched again – indicating a build-up, he had come to find – so he ceased his caresses on her clit again. She had gotten even wetter from his ministrations, a feat he hadn't thought possible, and his index finger slipped through the wetness inside her easily.

Amy moaned loudly. Sheldon's brain short-circuited. She was slick and warm around him. He moved his finger a little, pulling back out and pushing back in. Her back arched even more, and her hips seemed to be meeting his finger.

He was fully hard now. He had not expected that. At all. But his erection strained against his khakis. If Amy were to open her eyes, she'd surely notice. But Amy didn't seem capable of opening her eyes at the moment. She was moaning softly, and Sheldon's finger was slick with her. He removed it from her, and pushed two fingers inside her now.

Amy's eyes opened slightly, gasping loudly. She looked at him with a look of pure longing.

Her squirming increased. Sheldon was getting too hot for his own good now. It was all too stimulating; the hotness of her, his control over her, how she surrendered to him.

Sheldon removed his hand from her entirely. He caught his breath.

Amy made that whining noise again. "Sheldon… why'd you stop?" her voice sounded small and almost pathetic.

He smirked.

The power he held over her was insane. He was high on it. And completely too warm for his own good. He grabbed the hem of both his shirts and whipped them off in one go. He was too worked-up to even think about folding them; he threw them next to him on the floor.

Amy gaped at him. Her eyes roamed over his exposed chest.

He leaned into her, and crashed his mouth against hers. Amy moaned into his mouth, and his lips opened on their own accord. Her tongue brushed against his, and he met her without thinking it through. He had this sudden desire to consume her.

Their tongues moved against each other, and that was perhaps even more arousing than the power he had over her. He moved from her mouth to her neck, littering her skin with kisses.

He lapped at her neck, and Amy was writhing against him in seconds. She made the whiny noises again that went straight to his groin.

He caressed her leg again, moving to the top of her thighs.

"Sheldon," Amy moaned, hopefully almost.

"Yes?" he asked, pretending he didn't know what she wanted.

He pressed a final kiss to her neck and pulled away from her, looking her in the eye. His hand was almost at her centre again, and he could feel the heat radiating off her.

"Sheldon," she gasped. He realised she had to be delirious with want now.

His finger caressed her fleetingly between her thighs before he pulled his hand back again. Amy groaned frustratingly.

"What is it, Amy?" he asked, grinning.

"Touch me," she moaned. Her hips were moving again, trying to get him to touch her. Her back was arched and her brow was glistening with sweat.

"I am touching you," he said, his fingers skimming over the top of her thigh. Amy whined again, her hands tugging on the rope.

Sheldon chuckled. "Ask me nicely."

Amy's eyes opened and she stared at him. His gut coiled with desire as he saw the fire in her eyes. This game between them was unlike any other he ever played. He was strongly suspecting it would become his new favourite.

"Would you touch me?" Amy muttered, the anger and desperation in her voice evident.

"What, here?" Sheldon asked, rubbing her clit with his thumb. Amy's mouth fell open and the moan caught in her throat. He pushed two fingers inside her, and she moaned out loud this time.

"Yes," she uttered.

Sheldon removed his thumb and focussed on stretching her with his fingers, her body seemed to welcome his fingers, clamping down on him, sucking them in. Sheldon's wondered what that would feel like on his dick. He was painfully hard now.

Amy groaned again. "Sheldon…" she whined. "I asked nicely…"

She was becoming petulant, and he grinned. His thumb moved over her clit again, just a little. Amy gasped and squirmed, but he never gave her enough. The power was driving him insane. The little moans and groans escaping Amy's throat were only fuelling his desire to draw it out as long as possible.

"Sheldon," she mewled. Tears of frustration were leaking out of the corners of her eyes now.

"Beg me," he said, his voice low and demanding.

She stopped squirming and gaped at him. He raised an eyebrow at her, his thumb rubbed her clit briefly. She was speechless.

"Do you want this?" he demanded. His finger eased off her.

Amy gasped. Her hips moved against the fingers still pushing inside her.

"I think you do, Amy," he said lowly. "I think you're going crazy with the need for closure now… Or do you want me to drag it out even longer? I can go all night."

Amy mewled pathetically. He brushed her clit again, his fingers penetrating her slowly.

"Sheldon…"

The walls of her pussy squeezed around his fingers. He had lied before; he wasn't going to be able to go all night. He needed to come himself. And soon. He had never been this hard, this long before. But first, he needed to prove his point to Amy.

"Admit it," he muttered, barely touching her clit and retreating again. "I promise I'll make you come, just tell me I'm right."

Amy squirmed again. He could see she tried to stop herself from admitting it, but it was getting harder and harder for her to keep her resolve. He fingered her clit again, barely. Amy groaned.

"Please," she whispered so quietly that he barely heard it.

He stopped his caresses on her clit. She had to do a little more than that for him to give her what she wanted. The headboard creaked with the force with which she pulled on the ropes around her wrists. He still didn't give in. His hand was almost cramping up by now.

Sheldon caressed her clit again, softly and teasingly. Amy moaned softly.

"Sheldon, please," she said breathlessly. "Please… I beg you."

The power rushing through him was unprecedented. He groaned himself now. It only took him a few firm strokes against her clit to get her there. She cried out, and her body convulsed before him. It was a captivating sight; her back arched, her mouth open in a perfect 'O', her brow glistening with sweat. Her walls contracted around his fingers in a pulsing rhythm and he had to stop his mind from imaging that around his member. Surely she'd milk him dry.

She shook with spasms still, even after what seemed like at least a minute after she started orgasming. He removed his hand from her, careful not to stimulate her too much now. His hand was slick with her, and he wiped it on the sheet next to him before he reached up to untie Amy's hands from the headboard.

Her pulse was still racing when he lowered her arms carefully. She had to be cramping up by now, he assumed. Which was her own fault really; if she'd begged him earlier he would have complied. He wasn't that evil. Just a little bit.

Amy was breathing out slowly, her eyes closed and her brow furrowed. She looked irresistible.

He pressed a kiss to her cheek. "Do you have any condoms?" he muttered in her ear. He still held her hands and was able to feel her heartrate increase again.

He pulled back from her ear to look in her eyes. She looked a little shocked. He would be shocked himself, but this whole torture session had turned him on like never before. If she wasn't up for it – which would be fine – he would just take care of his raging erection by himself.

The need for closure was too much.

"Y-yes," Amy stuttered, "the top drawer."

She indicated to the nightstand next to her with a nod of her head. Sheldon looked at her. Her eyes were big as she stared at him.

"Unless you don't want to?" he asked, suddenly realising what he was about to do. Women always valued their virginity, he had been told. Perhaps she expected something different than this.

Her arms encircled his neck and he was pulled on top of her with a surprising force. His surprised yelp was muffled by her mouth. Amy kissed him deeply, her tongue stroking against his. Sheldon groaned in her mouth. He couldn't handle much more of this.

"Take off your pants," Amy mumbled against his mouth.

Sheldon nodded rapidly. He scrambled off the bed and proceeded to kick off his shoes. He was taking off his pants and briefs so fast he almost lost his footing. He kept his eyes on Amy. She was taking off her camisole and her brassiere and Sheldon stopped to stare at her.

She looked amazing.

Amy leaned over the bed to fish a condom out of the top drawer of her nightstand. She turned back and dropped it in shock.

"Shit," she mumbled, staring at his crotch. Sheldon blushed under her scrutinizing gaze. He wasn't that well-endowed. Was he? He had little to compare it to; when he had slept naked with the guys in the North Pole he hadn't really looked. And only Koothrappali had gotten an erection. From the nerves, he had claimed. Sheldon wasn't really sure.

He walked over to Amy and grabbed the condom from the mattress. She reached out to him, and her fingers grasped his member carefully. Even the barely-there touches of her fingers were almost too much for him.

"Amy," Sheldon groaned. "You mustn't. I'm not going to last long as it is."

She pulled her hand back immediately. "Sorry," she muttered, but she seemed to be suppressing a smirk.

Sheldon quickly put on the condom – he was lucky to have practiced this quite often - and moved onto the bed. He gasped in surprise when he was thrown down onto the bed by Amy. He stared at her as she crawled on top of him, a devious glint in her eyes.

"I nearly lost my mind just now," she murmured accusingly, her hands roaming over his chest. She had swung her leg over his waist, and her centre felt warm against his lower belly. Sheldon groaned lowly.

"You should have admitted defeat sooner," he rebutted, trying to sound stern but failing greatly. He was distracted by her hands caressing his chest. It was a good thing he had tied her up before; he wouldn't have been able to complete the experiment with her hands able to touch him.

"And miss out on you touching me? As if," she laughed drily.

Her right hand grasped him again, and she shifted her body a little lower. Sheldon could feel her rub his member against the wetness between her legs. It felt incredible already.

He swallowed thickly and reached out for her free hand. It felt more monumental than he had expected; doing it.

They stared at each other as Amy slowly lowered herself on top of him. Sheldon squeezed her hand firmly, his other hand taking hold of her hip. He exhaled deeply when he was buried to the hilt. Amy's legs trembled around him.

She felt amazing. Hot, tight, pulsing. Incredible. He was sure that the second she'd start to move, he'd lose it immediately.

"Amy," he groaned, squeezing her hip. She looked at him with big eyes.

"My God, Sheldon…" she mumbled. "You could have warned me about this. I feel so full."

His ego grew five sizes. He didn't really know how to respond to this. Instead he just pushed his hips up a little. Amy moaned.

"Does it hurt?" he muttered. It was almost impossible for him to form a complete sentence.

She shook her head. "No," she whispered. Her eyes stared him down. "It feels amazing."

Sheldon nodded slightly. Yes, it felt amazing. She was amazing.

Carefully, Amy began to move on top of him. Rising on her knees a little, and moving back down. Her body squeezed him, and he felt the sensations coursing through him already. He tried to close off his mind a little, holding off the inevitable.

His hands grasped her hips and he aided her in her movements, elongating his thrusts up into her, making her gasp out those breathy moans. He watched her breasts bounce up and down with each time she came down on top of him. It was way too stimulating.

Sheldon groaned her name. He pushed deep inside her and it was incredible. The tight grip she had on him, it was making him lose it.

"Amy, I can't hold off any longer," he mumbled apologetically. She hummed, moving on top of him languidly.

Sheldon stared at her face. He moved his right hand from her hip to where their bodies were joined and rubbed her clit with firm strokes. Amy cried out immediately. He shouldn't have done it; her body responded accordingly, squeezing around his dick.

"Aahhh," he groaned, low and guttural. "Amy…" it was a warning of sorts, but he kept up with his strokes on her clit. She mewled and her rhythm faltered.

Her body squeezed around him again, and it was his undoing. He gave in; his release washed over him. The euphoria moved through his veins, the adrenaline coursing through his body as he let go inside her. Finally. It felt even better than watching his impressive Domino lay-out fall to pieces.

Amy slowed down her movements, but she was holding onto his wrist, holding his hand against her.

"Please, Sheldon," she breathed, squirming on top of him.

He blinked through the hazy fog that surrounded him in the aftermath of his orgasm. She was begging him again. It was almost enough to get him hard again, but he was so spent.

"Don't tell me you need even more closure now, Amy?" he murmured, teasing her.

She huffed and moved his hand against her. "Sheldon…" she whined.

He listened to her pleas though, rubbing her clit firmly. She looked magnificent, writhing on top of him, squeezing his softening member. She gasped and his name left her lips in barely a whisper as she convulsed on top of him.

Sheldon caught her in his arms, panting and both covered in a thin layer of perspiration. He breathed out slowly for a minute. He should get cleaned up. He moved Amy off him carefully. He made his way to the bathroom and removed the condom. He stared at his reflection in the mirror. He hardly recognized himself, totally sexed out.

After washing up and drinking some much needed water, he made his way back to Amy's bedroom. She was right where he left her, naked and sated in her bed.

"Hey," she said, beckoning him over. He lay down next to her again, breathing out. He was exhausted.

"Okay, I admit that I may have a need for closure too," Amy whispered, while she ran her fingers through his chest hair.

"Your need for closure is even bigger than mine, Amy," Sheldon grumbled. "Or need I point out how you orgasmed twice and I only once?"

He had her there. Oh, how he loved the victory. He didn't even try to contain his smirk now.

"Hmm," Amy said, as if she was contemplating that. "Only once… for now."

Sheldon furrowed his brow, not following her. But before he knew it, Amy had crawled back on top of him, distracting him with kisses as she took hold of his arms, moving them upwards.

Sheldon could only stare at her in shock as she tied the rope around his wrists this time.

"I think it's time for me to experiment again, Sheldon," she said mischievously. "Prepare to beg for mercy."

END