Weeks passed since Sheldon and Missy's last bedroom encounter. Since then, Missy had been crawling into Georgie's bed more and more at night, and messing around exclusively with him. Interfering with Sheldon's nighttime experimenting would have been bad enough, but this affected his morning routine, as well.

Every morning, when they were woken up, Sheldon would sit back on his bed and wait for Missy. When she eventually rolled out of bed, she would put on a little show for him to get him excited for that night. She would start by pulling off her shirt, flipping her hair as it went over her head. Next, she would wave her butt at him as she pulled her pajama pants down to the floor. Finally, she would move her hands between the fabric of her panties and the skin of her hips, and pull them down really slowly, before kicking them at Sheldon (after enough times, she got good at hitting him in the face with them). Now naked, she would walk over to their dresser to pick out what clothes she wanted to wear for the day, accentuating her rear with each step. Sometimes, depending on what drawer she was searching through, she would even bend over or squat to really get Sheldon going.

At this point, their mother would usually knock on their door to hurry them along to breakfast. Once they assured her that they'd be down in a minute, Missy would bend over, spread her butt and pussy at him, and smile over her shoulder, sometimes inserting a finger or two, before hurrying to get dressed.

Normally, Sheldon despised the very thought of being unpunctual, but, for that view, he would have been late every single day.

Now, all of that was over. Instead, he was lying in his bed while Missy was having a sleepover with his rival, Paige. He first met Paige at a class, and had run into her multiple times after. To be honest, he didn't despise her as much as he let on; she knew her stuff and was pretty cute, to boot. Heck, he even chased after her during a lecture because of the way her dress was hugging her butt.

Just lying there, thoughts began to flood Sheldon's head, intensified by the soft whispers of the girls mere feet from him. He would love to just climb into their bedsheet fort and have his way with both of them.

Sheldon shook his head, trying to free himself of these thoughts; he was starting to get an erection and was not in the mood to figure out masturbation. However, the more pressing matter at hand was that somethings they said were weighing on him. Paige had given him some advice on not growing up so fast, and Missy had been calling him an old man all night.

Were they right? No… Missy knew this better than anyone. It was her fault they stopped having so much fun at night, and he was going to remind her.

Sheldon turned his head to Missy's bed and said, "You should know better than anyone how young I am; I can still get it up." Missy's head burst through the top of the fort, her face bright pink, and slowly darkening to red.

Paige followed suit and poked her head through the fort. "What's he talking about?" Paige asked. Sheldon had her on the ropes now, and there was nowhere to go but forward. He pushed his sheets aside and sat on the edge of his bed. He looked at Paige and informed her of their past.

Her face quickly grew as red as Missy's, but kept her composure, unlike her friend, who was hiding in the fort with her head in her hands. Paige moved the sheet that acted as a wall aside and stood to meet Sheldon face- to- face. "So, why'd you stop?" She asked. Sheldon shrugged. "You'd have to ask Missy. She started doing things with Georgie and just left me behind." Paige thought for a second before hitting the sheet, whispering, "Missy, come out here for a minute."

Missy slowly, but surely, peeked through the sheet, and sat on the edge of her bed, trying not to look at either of them. Paige stood between them and motioned her hand at Missy. "Missy, why'd you stop, um, *ahem*, having sex with Sheldon."

Missy glanced up into Sheldon's eyes. "Georgie just did things that you didn't. He was assertive, strong, and dominating, and was comfortable doing almost anything. I guess doing it with someone who already knew it all made me forget about learning with you."

Sheldon looked at the floor as Paige considered all this. "Now, Sheldon, how does that make you feel?" She asked. Sheldon took a breath and slowly exhaled. "It makes me feel lost and confused; I don't know what to do about these urges without you to relieve me of them, and not knowing something scares me. But, above all else, I feel useless, not being able to be enough for you.

Missy wiped a tear from her eye and jumped off her bed onto Sheldon's, tackling him before burying her head into his neck. "I'm sorry. I never meant to do that." Sheldon put his hand on her head, wanting to say something, but couldn't find the words.

Paige folded her hands and smiled at the couple, coming to a conclusion. "Well, there is only way to truly fix this." Missy pulled away from Sheldon and nodded. "Let's do it."

Paige held open the entrance to their fort and waited. Missy looked into Sheldon's eyes for a moment before kissing him on the nose. He froze as she let go of him, slid off the bed, and entered the opening with a come hither look over her shoulder. Paige followed her in and they closed the sheet.

Sheldon was left there, dumbfounded. He couldn't believe this was really happening; he must've fallen asleep at some point, but couldn't remember feeling drowsy. He pinched himself, just to make sure, and, sure enough, it was all real.

His consciousness now confirmed, he stepped off his bed and made his way to the girls'. He took a deep breath before grabbing the sheet they had gone behind. His hands were sweating and shaking, his heart was beating out of chest, and his mind was going blank. Frankly, he would've stood there all night if a shriek and a giggle from Missy didn't bring him back to his senses.

He grasped the sheet tightly and threw it aside. Behind the curtain he found the most beautiful sight he had seen in a long time. Missy lay on the bed, resting against a pile of stuffed animals, completely stripped of her pajamas, now only wearing a pair pink panties. Her arms were crossed over her chest, hugging a pillow, and her feet were placed right over left, but her legs were spread enough that her crotch was barely covered by the cloth.

Paige sat in the left foot corner, sitting cross- legged, prepared to observe. Sheldon climbed up onto the bed, into the girls' fort turned sexual sanctuary, never taking his eyes off Missy. Missy noticed his unblinking gaze and gaping mouth, and brought back his focus by clapping in his face. "I guess we're back to square one, eh? Come on! You aren't the only one who's been deprived, so, strip."

Sheldon followed her orders, but was confused. "I thought you were doing it constantly with Georgie?" He carefully unbuttoned his shirt and pulled it off. He tossed his shirt over the side of the bed and put his thumbs between his waistbands, preparing to pull his pants down.

Missy hugged the pillow close to her chest, and responded, "He said he wanted to start trying to get girls more his own age. I was going to tell you, but I just didn't think." Sheldon shimmied his pants down to his ankles, then pulled them off, putting them with his shirt.

Both Missy and Paige stared at him with wide eyes; Missy, at the bulge in his briefs, and Paige, at his tiny butt. Sheldon didn't notice their gazes, and proceeded to remove his last piece of clothing. He grabbed the back of his underwear's waistband and pulled it down, revealing his naked behind to Paige, making her quietly gasp. Sheldon pulled it further down, until the only thing they covered was his penis, which they were caught up on.

With a little more force, he slid them down, springing his penis free. Missy placed the pillow behind her and motioned Sheldon to come closer. He did as she asked, and crawled between her knees, his eyes dancing between her face, her bare chest, and her open legs.

Sheldon placed his hand on her crotch and took hold of its pink wrapping, his knuckle grazing her wet folds. Missy flinched, her pulse increasing, but managed to hold it together as Sheldon pulled her panties off and tossed them to Paige.

Now naked for all to see, they sat dazed with mouths agape, admiring each other's bodies. Sheldon was the first to move, lowering his head absent mindedly to Missy's crotch. He took in the smell of soap mixed with nervous sweat, the pure, smooth texture, and the shining wet lubricant dripping down into her butt crack.

He was so enthralled that he didn't notice his head moving closer, until Missy moaned when she felt his hot breath against her skin. He was about to back up, but Missy grabbed the back of his head and shoved him forward, enveloping his every sense in her pussy.

Sheldon's tongue danced across it, tasting every last bit of her, before, at long last, finding her hole. He rubbed his tongue along her insides and began to stir them, increasing her dampness. Missy's breath began to quiver and shake, and her eyes struggled to stay open.

Paige couldn't believe what she was seeing. The usually awkward and timid boy was eating out his sister, who was absolutely loving it. She felt herself start to get hot, and felt a wet aching in her pants.

After a minute or two, Missy let Sheldon up for air, and a kiss. She pulled him up to meet her face and slowly moved closer, until their lips connected. Their lips moved across each other, trading spit and Missy's lube.

Missy pulled away and looked Sheldon in the eye. "Are you ready?" He nodded, ready to relieve himself of his aching erection. He backed up and Missy spread her feet, then her folds with her hands. Sheldon was mesmerized; oh how he missed this.

He climbed back onto Missy, his hands under her armpits and his penis at her entrance. The twins prepared themselves, and Sheldon slowly slid into Missy. They both gasped at the long awaited jolt of hard, soft, wet, hot pleasure.

"Are you okay?" Sheldon asked. Missy managed a simple, "Yeah." That was all the reassurance Sheldon needed to pull back before slowly pushing back in, and taking Missy's breath away. Over and over, he humped her at this rhythm, before remembering her constant complaint in the past; go faster.

Sheldon's hips suddenly increased in speed, shocking Missy to her core. With every thrust, wet squelching sounds could be heard, and with every pull, drops of Missy's juices were sprayed onto the sheets.

Before long, the sound, the smell, and the feel of their lovemaking became too much for them. Missy wrapped her arms tightly around Sheldon as her vag tightly squeezed around his dick, and squirted a little bit onto him. Simultaneously, Sheldon pushed as far as he could into her, letting pump after pump of cum spill into her.

When his orgasmed calmed down, Sheldon collapsed onto Missy's chest, and that's where he lay, as Missy ran her fingers along the hair on the back of his neck and her crotch twitched against him. At least, until Missy tapped him on the shoulder and pointed to the corner of the bed.

Paige was sitting there, her knees to her chin, one hand in her pants and the other under her shirt, moaning away.

Missy sighed and motioned Sheldon to back off of her. Sheldon reluctantly complied and pulled himself off and out of her. Missy struggled to her wobbly knees. Once stable, she crawled over to Paige, dripping her cream pie onto the bed.

She waved her hand in front of Paige, which seemed almost ineffective, until she tensed up into a ball, moaning at a higher pitch than before, then stopping and collapsing sideways onto the bed.

Missy put her hand on Paige's shoulder and turned her head sideways to look her in the eye. "Did you just jerk off to us?" She asked. Paige hesitantly nodded before hiding her face in shame. Missy looked back at Sheldon, who wasn't able to give any support.

She turned back and said, "You know, if Sheldon and I turned you on that much, we could help out." Paige looked excited for a moment before turning disappointed. "I can't. My mind isn't the only thing that matured faster than normal; I've had a period already, so vaginal isn't safe."

Missy thought for a second, then came up with an ingenious idea, or, at least, ingenious to her. "You could have Sheldon put his thing in your butt while I play with your hole."

A smile beamed across Paige's face as she sat up. She looked around Missy to see what Sheldon thought about the plan; he was torn. On the one hand, this could be the only chance he could get to do anything like this with Paige. On the other, "Are you joking? That's the dirtiest place on the body! There's no way I'm going in there!"

Paige cocked an eyebrow and smirked. "Do you think you're the only one who has a problem with being dirty? I take a shower every day, and clean my butt thoroughly each time. I spray water into my hole, then scrub it by wrapping a cloth around my finger and putting it up there; rinse and repeat."

Sheldon was impressed by her process, but was still hesitant. "Show me." Paige looked at Missy, who nodded. Paige began undoing the buttons on her shirt, and Missy grabbed her pants by the ankles. They pulled both pieces of fabric off at the same time, leaving her in only a pair of white panties.

Paige rested back on her hands, bearing her body for the siblings to see, which they both took full advantage of, ogling at their friend. Overall, she was much skinnier than most people her age, but her chest was more developed than Missy's, just not to the point of having noticeable breasts yet.

Missy crawled closer and grabbed Paige's underwear by the waist band and stuck her thumbs through the leg holes. She slowly pulled them down, revealing the main event, for a second; Paige crossed her legs to hide herself. She looked at Missy while pointing at Sheldon, saying, "Could you blindfold him?" Missy caught onto her plan and quickly moved to Sheldon to cover his eyes with her hands.

Paige turned around, giving Missy a great first view of her crack. She got on her knees, then bent over, sticking her ass in the air. "Alright", she said. Missy removed her hands from Sheldon's eyes and Paige spread her butt cheeks.

Immediately, Sheldon's penis fully erected. He stared, but still couldn't believe it was real. Her butt was like pure snow; pale white and spotless. Paige smiled between her legs and said, "See? All clean." Sheldon swallowed a mouthful of saliva that pooled. "Fair enough." He said.

Missy slapped him on the back, once again bringing him back to earth, as well as pushing him closer to Paige. Sheldon inched closer, until his face was nearly in her crack. He hesitated, remembering the last time he put his tongue in a butt hole. However, he reassured himself that Paige was far cleaner than Missy, and stuck his nose and mouth between her cheeks.

Paige gasped at the sudden contact and breath on her skin. Sheldon inhaled and began to lick her; she smelled and tasted like skin, nothing more. He ran his tongue up and down her skin, grazing her hole on each pass.

Paige buried her face in the bed's sheets to stifle her moans. After a few more licks, Sheldon took the dive and stuck his tongue directly into her anus. This sudden feeling of her penetration had Paige's toes curling and legs squirming, but she endured, taking in every movement. Sheldon moved his tongue in and out, feeling her sticky walls against it.

He then tried to move his tongue more, to squish his tongue against her, but found he couldn't; she was too tight. He pulled his tongue out and replaced them with two of his fingers. He spread his fingers apart, slowly spreading Paige's butt hole open. Paige had begun to become restless; her position was growing increasingly uncomfortable, and Sheldon's inspection of her wasn't helping.

She fell forwards, pulling Sheldon's fingers out of her and landing flat on the bed. She panted as she tried to speak, "So… what's the matter?" Sheldon brought his clean hand to his mouth and reported his findings. "You were far too tight for even my tongue; there's no way my penis will fit without proper preparation. First, we need a less strenuous stance, to help you relax and loosen up. Second, we need more lubrication than your anus produces."

Paige mulled it over, but it was Missy who came up with the plan. "You can do it on all fours, like a dog; it'll keep you neck from getting stiff and help you balance better. If you do get tired, just lay on me and keep going. For lube, just run your dick up Paige's crotch after I get her going."

The three nodded and went to it. Missy lay flat on the bed and Paige climbed on top of her. They smiled at each other and held each other's hands. "What does it feel like?" Paige asked. "I've never really done it in my butt." Missy answered. "But, the way we do it, it feels odd at first, like someone's poking your stomach. Then, it feels… unbelievable."

Paige gave a light smile and sat on Missy's leg. She began to rub her crotch along it, getting wetter and hornier by the second. With each slide, her knee rubbed against Missy's crotch, turning her on as well. Soon, they became so enthralled in themselves that they forgot about Sheldon. It was only after Paige leaned down, kissed Missy between her nipples, and locked lips with her, did Sheldon bring them back, this time. "*Ahem* Are you ready?"

Paige pulled her lips off of Missy's, who shot her a wink. She raised herself off of Missy's leg, strings of sticky lubricant stretching between them, and waited. Missy turned around under her, and positioned her head between Paige's legs, small drops dripping onto her forehead. Sheldon moved to right behind Paige, and spread her butt cheeks open.

He ran his penis along her vagina, coating it in a layer of lubricant. Paige contained all bodily reactions as best she could, but a small whimper broke through and a shiver went up her spine. He brought his tip to Paige's anus, her soft butt cheeks pressing against his legs, and said, "Here I go." He pushed it inside, and, immediately, she tensed up, tightening around Sheldon until he could no longer move.

He waited until she calmed down, then began to move again. They did this multiple times, until Sheldon was all the way inside. Paige took a breather, then waved him on to keep coming. Sheldon backed out about half way, then pushed back in. He did this repeatedly, stopping anytime she needed a break.

It took a bit, but they eventually got down a rhythm, and Paige began to let her voice out again. Her moans became so loud that she buried her face between Missy's legs, grabbing handfuls of their bedsheets.

Missy felt the moans, and decided to pay her back. She reached up and stuck two of her fingers in Paige's pussy, moving them in and out with Sheldon's thrusts. She then started, unknowingly, rubbing Paige's clit with her thumb.

This pushed Paige over the edge, making her shake and tense harder than the twins had ever before, and collapsed on top of Missy. Sheldon, still inside her, was pulled down with her, and ended up sitting on Missy's face.

He continued, as per the plan, and came in her ass after a few more hard thrusts. He laid on top of Paige, feeling content in her clean smell and the softness of her butt hugging his cock and balls.

Missy tapped both of them on the arm, and said, muffled under the pile, "Get up! I'm getting squashed!" Sheldon pulled out of Paige, who, when she knelt over Missy, oozed Sheldon's cum down to her crotch. Missy saw this and immediately lapped it up as soon as she was free, making Paige shutter.

They both laughed and fell onto Missy's pillow and stuffed animals, where they cuddled each other in a naked bliss. Paige motioned for Sheldon to join them, which he, reluctantly, did. He laid between them and they hugged him, pressing their chests against his arms and their crotches against his legs.

Paige ran her fingers through his hair and said, "Sheldon, this was a good step towards a more carefree childhood, but, look into the psychology article and try something more innocent next time."

Sheldon leaned his head back and took in his surroundings. On either side of him was an adorable girl, who each just had sex with him. Maybe, he should start listening to Paige. "Alright, I'll look into it."

In their nude afterglow, the three kids fell into a much needed sleep.