A/N: This was just a little writing exercise for me so that I can stay warm while I work on the rest of my proper Fanfic Overwritten (it's a story set in the future of Steins Gate which features the main cast plus some added extras). I feel like this scene has been recreated multiple times by smut writers, but I decided to take a shot at this in my own kind of way. I hope you guys can enjoy the emotional parts just as much as the sexual parts in here. Cheers~Quil.

P.S: If you want a good continuation of the story (not to toot my own horn or anything), feel free to check out Overwritten, I swear you won't be disappointed with it.

Okabe raced back into the lab and started inputting the numbers to send him back in time to save Mayuri again.

There's no way I can just abandon Kurisu, he thought to himself. I can't just let her die and then move on. What would be the point in that?! I...

He put the headgear on, and was about to press enter before a small hand held his finger in place. Okabe, startled, turned his head over to the owner of the hand and found a heavily-breathing Kurisu whose clothes and hair were drenched from the rain she ran through to catch up to him. They remained there for a bit, Okabe eyeing the redhead in a silent wonder.

"Running will," Kurisu paused a bit to compose herself. "Running will only make it worse!"

Okabe grit his teeth in anger and pulled his hand out of hers. "Shut up!"

He turned away from everything. The time-leap machine, Kurisu, the Beta worldline, he couldn't help the guilt and sadness he felt from everything that had happened to him in the past dozens of time leaps.

"Time-leaping won't get you over the 1% barrier no matter how hard you try!"

"We don't know that for sure!"

"You'll only end up watching Mayuri die!" she continued yelling at him almost as if trying to drive her point home. "Again and again...it'll break you!"

"It won't," he hopelessly explained. "Do you know how many times I've seen Mayuri die already? I've seen it again,and again, and again, and again, and again. It won't break me now! It doesn't matter how many times-"

He was interrupted by a cold hard slap to the cheek. He was dumbfounded, almost as if all the thoughts he had which defended his choice to keep time-leaping seemingly vanished without a trace.

"Do you know what you're saying?" Kurisu said. "Mayuri is going to keep suffering and dying! You can't be okay with that! If that doesn't affect you, then your heart is already broken. Stop this. It really will destroy you..."

Kurisu began tearing up, almost as if she was feeling the pain that Okabe suffered with each time-leap.

"I know," Okabe took off the headgear and placed it back on the desk. He still couldn't stand facing Kurisu. "I've realized it for a while. I stopped being shocked as Mayuri kept dying and dying. At some point, my heart grew numb to it. Sometimes I waited to time leap just so I could know her precise time of death. At some point, I stopped being affected by her deaths. Some part of me would casually say I could just redo things..."

They both stood there for a while. Okabe was unsure what to say next. He didn't know what Kurisu wanted him to do nor could he ever force it out of her. This entire crisis was his burden to bear, yet he still made his friends suffer for it. Kurisu stayed silent as well, almost as if she herself was deliberating on what to do.

"Save Mayuri," she plainly stated. "Otherwise it really will break you."

Her voice became more impassioned. "If you let Mayuri die, you will regret it! The wish to save her is what's brought the two of us this far! If you give up now, you'll regret it for the rest of your life."

Okabe couldn't stand letting Kurisu belittle her own life He began turning toward her. "But if I save Mayuri, you'll-!"

"I'll just go back!" Kurisu grabbed hold of his arm and looked deeply into his eyes. "I'll go back to the initial worldline where the D-Mail was never sent! It's what's best for me, and for you!"

Okabe lost. There was no way he could bring himself to go back against Kurisu's wishes. He slumped in defeat before breaking free of Kurisu's hold and wrapping her in an embrace instead.

Kurisu softly gasped in surprise.

We've fought so many times over these past twenty days, Okabe thought to himself as he was embracing Kurisu. We've said nasty things to each other. We've shared our problems. Whenever I was in a bind, I turned to Kurisu for help.

His embrace around her got tighter, but she still stood there motionless.

It was Kurisu who quietly listened to me and believed me. A girl prodigy who published a scientific paper at 18. Always calm, always headstrong. Always full of pride, and nosy. So indulgent that she's diligent. Her theories always mesmerized me. I remembered every word she said. I watched every move she made. She's not just a fellow lab member. To me, Makise Kurisu is...

Okabe released Kurisu from his embrace. He kept his hands on her shoulders as they both averted their gaze from each other.

"I can't save you...I'm sorry."

He let go and walked away, unable to hold it together in front of her for much longer. He decided to look out the window, a view blocked by the plastic curtains.

"Thank you," Kurisu softly said. "For suffering so much for me."

Okabe grasped at the curtains, squeezing them together, providing a viewhole for him to look through. "Why you? Why'd it have to be you?"

He was close to breaking down into tears. He could hear Kurisu approach with a single footstep.

"Say, what does it mean to change world lines anyway?" she said. "Who knows, maybe you'll completely cease to exist in this world line the moment you go to the Beta world line. Or maybe you'll switch places with a different Okabe."

"It doesn't matter."

"That's not true. I won't have died. Even if I'm dead in the Beta world line, there's no guarantee I'll die here! Maybe there are doubles of me on countless world lines. Maybe all their lines are connected, forming a single 'me'. That sounds wonderful don't you think?"

Kurisu let out a hopeful breath as Okabe kept peering out the curtains.

"Being in all times in all places. A strong love for someone. A strong belief in something. A strong wish to convey something. If all those things go beyond time to create 'you', then that would be magnificent."

Okabe felt Kurisu hold a stronger gaze on him than before.

"So don't think of it as letting me die. Even if the world line changes, as long as you don't forget me, I'll always be there. So..."

Okabe could feel his resolve strengthen. Kurisu was not just a simple lab member to him. Kurisu wasn't someone he merely cared about. Kurisu was nowhere near someone he considered a friend.

"I'll never forget about you," he interrupted her and closed the distance between them. "I could never forget the person who I care about the most."

Kurisu's breath got caught in her throat. "Is that..."

"It's the truth," he bluntly stated.

"W-What? This is so sudden!"

Kurisu blushed a bit, caught off-guard by Okabe's total honesty about how he felt about her.

"I love you."

That's right. He loved Kurisu. Nothing could change that at that point in time. He needed her to know that. He needed her to know just how special he considered her to be in his heart.

Kurisu just let out a surprised yelp in response. Whatever rational mind she had before his confession was utterly blown apart and she found herself unable to formulate a proper response.

"What about you?" Okabe wasn't going to let this go to waste.

"Wh-What do you mean?"

Okabe closed the distance some more. "I want to know. How do you feel about me?"

Kurisu averted her eyes for a brief moment. "You really want to know?"

"Yeah."

"Your face..."

"Wh-"

"Close your eyes," she ordered.

"What for?" he exasperatedly said.

"Just close them."

Okabe followed her orders and closed his eyes. He didn't know whether to prepare for a slap or not. He felt Kurisu tug at the lapels on his labcoat and pull him closer to her. For the briefest moment, there was nothing, just a silence that he dared not break.

Then he felt his lips up against hers for the briefest moment. It was a brief moment, but in that moment, millions of synapses fired in his brain, bringing him into a hyper-sensitive state where he could feel everything just slow down. Kurisu's lips were soft against his and for that brief moment, they were all he needed to keep his brain functioning.

They stood there, lips locked, both motionless as Okabe was able to snap himself out of his daze. Okabe could taste the lemony scent that emanated from Kurisu's lips, but he didn't bother pushing his luck by going any further. At least not yet.

They finally separated.

"I-I didn't do that because I wanted to, you know," Kurisu went to being a tsundere and averted her gaze once more. "It's just, intense experiences accompanying certain actions - like your first kiss - are stored in the hippocampus and thus harder to forget. So I thought-"

"Too bad," Okabe interrupted her. "That wasn't my first kiss."

Okabe couldn't help but smile at the thought that Kurisu thought they shared their first ever kiss together. His arrogant smile warranted him a comment.

"You stuck-up virgin!"

"Shut up, untouched maiden," Okabe faced her once more. "My first kiss wasn't romantic at all though. Still, this wasn't enough to be memorable."

He was pushing his luck with her, but he had nothing left to lose at this point. "Let's do it over."

He grabbed her face, but waited for her permission before kissing her again.

"I-I guess so. It's just a kiss though, so I don't see much of a problem with it."

Kurisu stood on her toes while Okabe bent down to meet her. Their lips locked for a second time. This second time was quicker than the first though. So they went again. Okabe lowered his hands down to Kurisu's waist and pulled her closer to him as they kissed. They released once more, but they both silently agreed to kiss yet again.

These kisses weren't filled with ravenous hunger nor were they filled with lust. It was a passionate love that they had for each other, a love that Okabe never felt Kurisu would ever reciprocate. The rain tapped against the window, bringing Okabe back to the world that he had seemingly left when he first started talking to Kurisu. He broke the kiss and looked out the window, still embracing her as she was him.

"I don't have an umbrella," he said. "I don't know how long the storm is going to last either."

"I'll wait as long as I need to in here."

Okabe smiled before pulling Kurisu into another kiss. Knowing Kurisu was willing to stay as long as she needed to with him prompted him to begin testing the bounds of what he could do.

He stuck his tongue out of his mouth and began prodding at Kurisu's lips. Kurisu flinched in surprise, but she parted her lips and let Okabe enter her mouth. His tongue began exploring around, getting a feel for everything it could before it was blocked by Kurisu's own tongue. It was here that the passion turned to hunger. Their tongues began their own little clash, twirling around each other as they tried gaining dominance over the other. This little war ended up being taxing and they both had to pull away in order to breathe properly.

Kurisu grabbed Okabe by the labcoat as she did before, her eyes seemed as if they were glazed over. It seemed like she decided not to inhibit herself any longer.

She guided Okabe over to the lab's couch and sat him on it before straddling his crotch and re-engaging in the kissing match with him. Okabe broke free shortly afterward and instead aimed for Kurisu's exposed neck. He sucked on it, eliciting a soft moan from her while also causing her to begin grinding on his crotch. He took in everything he could get, going after the raindrops that were still present on her skin to how she tasted in general. Her skin was soft to the touch, but it was heaven-like when he ran his tongue over it. By this point, Kurisu had closed her eyes and was enjoying everything she could out of Okabe's attack on her neck. She was caught off-guard when Okabe stood up, forcing her to wrap her legs around him as he walked toward the lab's bedroom.

The bedroom was hardly ever used. Mayuri slept in it whenever she visited, but Okabe always preferred the couch no matter what. The bed was neatly made, and there was no dust to be seen, evidence that Mayuri had spent the night just a couple days prior.

Okabe let Kurisu fall on the bed before climbing onto it after her. His lips reconnected with hers as they got settled atop the bed. It was here that he had to pause though.

"Kurisu," he said. "Are you sure?"

Kurisu merely nodded her approval before Okabe continued his attack on her neck. However, while he did that, his hands began undoing the buttons to Kurisu's shirt. Kurisu, obviously unopposed, allowed Okabe do the work for her as she sat there. Okabe was able to undo Kurisu's shirt and slid it off her shoulders, revealing the lacy blue bra that she wore beneath it when she was soaked to the bone just an hour before.

Okabe paused, taking in the sight before him. Kurisu instinctively covered herself with her arms, feeling embarassed at the her lack of clothing as well as the fact that her breasts weren't as big as Mayuri's.

The mad scientist let out a small chuckle at the girl's pathetic attempts to cover herself from him.

"Don't laugh," she said. "It's hard for me to not feel self-conscious about how I look."

"You look beautiful," Okabe responded as he took Kurisu's arms and placed them above her head while pushing her to the bed. "And nothing will change my mind about that."

"I-idiot!" Kurisu hissed. "I took off my shirt. How come you're not taking your clothes off?"

Okabe got up again, slightly annoyed at being forced to hold off from admiring Kurisu's body. He took his labcoat off, allowing his arms to get a feeling of the cool hotness of his surroundings. At this point, Okabe lost care for what he looked like to Kurisu, there was no way he was going to be awkward now and waste the chance he had with her. He took off his shirt and immediately fell back onto Kurisu, attacking her neck once again. This sudden movement surprised Kurisu, warranting a yelp followed by a moan in pleasure. Okabe made his way down to Kurisu's chest, tracing his path along her collarbone and down the middle in the valley of her breasts. He resurfaced, much to Kurisu's displeaure, to look her in the eyes once more. Kurisu, understanding, nodded her head before reaching behind her back and undoing the clasp that held her bra together.

The bra fell, revealing Kurisu's breasts in all their glory to Okabe. Two white mounds of flesh, two equally pink nipples, one exceptionally hot girl. Kurisu fought the urge to cover herself yet again, but it didn't take long as Okabe dove back in attacking her right breast. He playfully rolled his tongue around the nipple, while holding Kurisu's other breast in his hand. Kurisu gasped and became more liberal in her moans as waves of pleasure began making their way from her chest down to her womanly core.

"O-Okabe," she gasped. "P-Please."

"Please what," Okabe said, his tongue still rolling around Kurisu's, now erect, right nipple.

"Please...the other one," Kurisu managed in between moans.

Okabe switched targets, attaching himself to Kurisu's left nipple and sucking on it lightly while kneading the other breast. It took a short amount of time before he was able to bring Kurisu's left nipple to attention as well. Kurisu, up to this point, had been the receiver of such great pleasure, so she felt the need to pay Okabe back for what he's done to her. She took the mad scientist by surprise as he was about to dive in again by flipping their position, making her the person on top. Kurisu smiled at Okabe's surprise and began sliding her hand down from his chest to his pants very slowly. The bulge in Okabe's pants was becoming harder and harder to conceal and he struggled to keep a straight face through the pain that his prison of material was inflicting on his member. Kurisu gripped at Okabe's member over his pants, forcing a grunt out of the man.

Kurisu began to unbutton Okabe's pants, freeing some of the pressure from his member. She then pulled them off with his boxers, causing his erection to burst free at full height. Kurisu sat there in silent awe at the size of his erection before getting to work in repaying Okabe for his services. Okabe prided himself in being above-average and seeing the look on Kurisu's face made the whole thing far more pleasurable. She placed her hand on his sensitive member and started sliding it up and down. If Okabe was feeling pleasure at that point, then nothing could have prepared him for the moment when Kurisu placed her mouth over his junk and jerked him off at the same time.

No doubt a lesson taught by the 2chan boards, Okabe could barely muster thinking.

Kurisu's mouth was warm and wet and it slid up and down his erection at a slow, almost teasing pace. When she came back to the top, she licked around the tip of his member before sticking it back in her mouth. Okabe grunted in pleasure, but he staved off any sort of climax because he didn't want this moment to end too soon. He grabbed Kurisu by the back of the head and forced her all the way down his erection, keeping her there until she finally pushed against him to have him release her. When she came up, a line of saliva attached her bottom lip to his erection before Kurisu licked it away. Surprisingly, she wasn't upset at the stunt Okabe pulled. Instead, she seemed hungrier for even more. She went back down, but this time she picked up the pace. She also began fondling Okabe's balls, eliciting a silent moan from the man who was only capable of grunting up until that point. Using this to her advantage, Kurisu switched it up and began sucking on Okabe's balls while she continued jerking him off.

If he were anyone else, Okabe may have already released his seed all over the place, but being a man raised by doujinshi, he trained himself to keep everything at bay. He could feel Kurisu let go of his member.

"Okabe," she said in a pleading tone. "I want you."

This statement from Kurisu was like dousing fire with gasoline. Okabe immediately flipped her over, taking her spot from ontop and tore off her shorts and pantyhose. All that was left between him and her entrance was a pair of black panties. He traced the outline of her entrance, causing her to moan and arch her back. He could feel her panties moist to the touch, driving him farther over the edge until he just had to tear the piece of black clothing off.

It was a sight for Okabe to admire. Kurisu was clean-shaven save for a thin black line leading down from her pelvis to her entrance. Kurisu's entrance was glistening with her juices wrought on by the highly erotic scene that had been leading up to this, which chipped away at the last of Okabe's inhibitions and causing him to engulf her entrance with his mouth. He outlined it with his tongue, causing Kurisu to moan even more. He then focused his attention on the little nub that controlled her pleasure. He playfully sucked on it, which made Kurisu let out a high-pitched yelp in pleasure. At the same time, he used his middle finger and pierced her entrance, but most of the pleasure was coming from his mouth. He licked at her clit, sucked on it, and playfully bit it. These actions drove Kurisu over the edge.

"Okabe!" she screamed. "I-I'm cumming!"

Okabe's finger and chin got drenched in Kurisu's juices. He lapped up whatever he could, relishing in how sweet she tasted and not giving Kurisu any chance to catch her bearings before sending her down another road of pleasure. She merely responded by shoving his head deeper into her entrance the same way that he did to her, but Okabe found no problem with it. He darted his tongue in and out of Kurisu, much to her liking. With the only warning being a scream of gratification, more of Kurisu's juices poured out of her, but this time Okabe lapped them all up without a problem.

"Okabe," she said. "I want you inside me."

The man in question pushed himself up from his spot and positioned the tip of his member in just the right spot.

"Are you sure?" he said regaining some of the inhibition he needed to get her consent.

She nodded. "But do it slowly, please."

Okabe took her request in account and slowly penetrated her. Kurisu was tight, but not uncomfortably so. It took Okabe all manner of control to not begin thrusting uncontrollably and instead continue pushing slowly into her, He then reached the barrier, her hymen. He looked at her one last time, giving her one last chance to call it quits, but she still nodded with clenched teeth. Okabe exerted more force, breaking through her hymen and causing Kurisu to gasp in pain. Okabe remained motionless inside her until she could get her wits about her again.

"Keep going," she said through clenched teeth. "I'll get used to it."

Okabe slowly began to thrust, feeling Kurisu's walls begin to loosen a bit more as she got more and more excited. Her gasps of pain were followed by the same moans she elicited before he penetrated her. It was here that Okabe decided to pick up the pace, making Kurisu yelp at the sudden increase in speed before succumbing to the intense pleasure that was cascading over her from the stimulation to her G-Spot. The only thing coming out of Kurisu at this point was moaning as Okabe thrust in and out of her with mounting force. He felt himself getting closer and closer to the edge, but his goal before hand was to get Kurisu to climax one more time before he released his seed. He pounded into her, lifting her leg up so that he could position himself to thrust even harder.

Kurisu could feel Okabe's thrusts all the way up into her uterus. So much for doing it slowly.

The pain that was supposed to come with having her uterus being pounded by the man was masked by all sorts of pleasure he was evoking on her. She felt herself close to climaxing once again. Her moans gave way to screams yet again.

"Okabe! I'm cumming!"

Okabe felt Kurisu's walls tighten around his member, driving the final nail in the coffin for him.

"Kurisu," he grunted. The only warning he would ever give her that he was cumming as well.

He never even asked her permission to climax inside of her. He was bursting and was now thinking with his second brain instead of his actual one. He thrust one last time, getting as deep as he could and shot his load inside her. Just this action alone prompted Kurisu to moan in pleasure.

"It's so warm~" she said sing-songy like. "Ahh~"

Okabe pulled out, allowing some of his cum to spill out. Being the cheap person he was, he swabbed it up before it could touch the bed and presented his fingers to Kurisu who happily sucked the cum off them.

It was then that Okabe realized.

"Oh my God," he gasped. "Kurisu, was it okay that I came inside you?"

Kurisu couldn't help chuckling.

"You're fine, dummy," she said. "Luckily for you, I just got off my period a couple days ago."

She still slapped him though.

"If you ever do that to me again, I'll rip your dick off and feed it to the Koi personally."

Okabe rubbed his face, more at ease now that he knows he's most likely safe from accidentally forcing a child upon Kurisu. However, his feeling of ease could only be replaced with melancholy after what she had just said.

Again. As if there ever was going to be an again. He knew this was going to be his last chance before he was forced to jump world lines and abandon her. This experience alone would be enough to make him want to stay, but he knew this would have been against everything Kurisu would have wished for. He sighed and got up off the bed, giving Kurisu room to get up as well.

"You filled me up," she said really erotically as she stood. Had Okabe not came just moments prior, he would have already sprung another erection, but he was worn out.

She was holding her hand to her entrance, trying to catch whatever came falling out. She started walking out of the bedroom and into the lab's main room, empowered by Okabe to walk as naked as she did because of how much he appreciated her body. Okabe stayed behind, still being assaulted by the fact that his time with Kurisu was nearing an end.

"Okabe~!" Kurisu called. "Would you like to join me in the shower?"

Okabe walked out, masking his somber look with a smile. "Of course."

He chased her behind the curtain and they turned the shower on, embracing each other as the water warmed up and began hitting them. It was here that Kurisu just started humming. It was a simple tune, but it was almost angelic when her voice combined with the stream of water hitting them. It seemed like Kurisu was well-aware of the fact that this would be their last time together, she just never called attention to it.

"Time is passing by so quickly," she said against his chest. "I almost want to complain to Einstein right now. You know, Okabe, time speeds up or slows down depending on a person's perception. The theory of relativity... it's so romantic, yet it's so sad."

They remained there, hugging each other. Okabe not bothering to say another word. He just wanted to enjoy these last couple of moments with the woman he loved. That's all he could ever ask for.