Kiss of Logic.

(N/A: You need to have read up to chapter ten of my fanfic called Baby Stone to understand this fic).

Kiss Kohaku? Senku pondered the idea in his mind as he sat next to her on the bed, staring into each other's eyes as if they were the protagonists of some cheap shojo manga.

Oh, and he was drunk. Again.

And it turns out he had a latent erection begging her for just a little stimulation. Well, not just a little, he honestly wanted her to throw him back on the bed and get on top of him and... Yeah... he was definitely too drunk.

To top it off, Kohaku wasn't helping at all to lower his testosterone and progesterone levels by looking at him as if she was contemplating whether she should pull him for a kiss or throw him back on the bed to have her way with him. She wasn't drunk, but it would seem she was no less blinded by hormones than he was.

It had been many months since the first and last time they had sex, but up to now, the memories were still fresh in his mind that he literally could think of nothing else but to repeat the act with her. Hearing those erotic sounds she made when she rubbed against him, or making her scream while he had his head in between her legs; tasting the flavor of her juices, which was surprisingly pleasant – or maybe his hormones were capable of even clouding his taste buds. He didn't really care, he just wanted to feel that immense pleasure again, and make her lose her mind at the same time.

In the midst of these numerous thoughts worthy of an urged pubescent, he didn't even realize that he was getting closer and closer to Kohaku's face, and that she was getting closer too.

There was no doubt that this attraction was mutual, and that only made him even more determined to take things as far as they could go. He wanted everything with her and he wanted it right now, not giving a damn about the consequences.

Maybe already having a brat should have taught him his lesson, but the irrational part of his brain joined with the rational part for a millisecond to whisper to him that she was going through the puerperium anyway and the odds of giving his daughter a baby brother so soon were pretty slim. Though after that the rational and irrational part went back to warring, one reminding him that the risk was there anyway and that they shouldn't be doing this too for many other reasons and the other was whispering to him of how good it felt to just give in to his instincts.

When his lips finally met Kohaku's, the war ended with a landslide victory of his irrational side over the rational.

Fuck it all, there was no way he was going to stop this now.

It was strange, the feeling of kissing someone. They'd had sex before, but this was the first time they'd kissed, and it actually lowered his libido even just a little to feel the shyness and gentleness of her lips against his. This was... very nice, her lips were soft and full, a little parched, but that was quickly solved by running his tongue along her lower lip and then into her cavity, tasting the pleasant flavor of the fruit juice she had been drinking throughout the celebratory party their friends threw for their daughter against their wishes. But if that party had triggered this encounter, he honestly couldn't feel upset about it anymore.

Maybe the alcohol was clouding his senses too much but, conscious of that or not, he didn't give a shit.

He brought his hands to her waist as he continued to try that French kiss thing. Maybe it was a bit rushed for the first ten minutes of making out, and he wasn't entirely sure he was doing it right, but at least he knew it felt good and she seemed to feel the same, as she was starting to mimic his movements, bringing one hand to hold the back of his neck and the other to rest on his chest.

When he tried locking her lower lip between his teeth, tugging a little, a small moan escaped from the back of Kohaku's throat, causing Senku's libido to burst back into full force.

He didn't think twice and moved his hands to her shoulders, urging her to lie down on the bed and immediately moving on top of her, without breaking the kiss, which was innocent again for a moment when he felt her a little hesitant about his intentions.

Even though he was disgustingly drunk, if she told him to stop, he was going to stop and he would be forced to take a cold shower to increase the smooth muscle activity in his groin, which would lead to the blood vessels contracting and the erection going away by cutting off the blood supply, that is if he was lucky and it wasn't necessary for him to resort to masturbating like an urged pubescent.

But it would be fortunate if she didn't want to stop at all, and by the way she quickly wrapped her arms around his back to glue him to her and deepen the kiss, Senku suspected she also didn't want to stop what they were doing. She seemed to want another passionate session of unsafe, but so absurdly pleasurable sex that it was almost ridiculous.

Hearing her moan once more, he couldn't resist the urge to press his body against hers and rub his erection shamelessly against her crotch, feeling the heat radiating from that area even while still clothed. That made her squirm and moan more, and suddenly she moved her hands to his shoulders and pushed him aside to place herself on top of him, again, just like in his fantasies of a few minutes ago.

Kohaku began rocking her hips back and forth, throwing her head back as she gasped lasciviously, driving Senku completely crazy.

He brought his hands to her buttocks, squeezing them without any restraint, grunting when she squealed a little and increased the intensity of her movements. That made him lose more of what little reason he had left and he quickly slipped his hands under her nightgown, enjoying the feel of her soft skin under his fingers.

His eyes left her flushed face for a moment to wander down her body, enjoying the way her breasts jiggled from her jerky movements and cursing the fabric preventing him from seeing her contorting skin as she rubbed against him.

Unable to contain his desire, he suddenly sat up and kissed her again, bringing his hands to her hips to slowly move down to her legs, caressing her thighs before taking hold of the edges of her nightgown and lifting it up, taking his time to brush against her skin in the process of removing it completely, leaving her only in her underwear.

However, never being the type to beat around the bush, he quickly grabbed her bra as well and removed it, ignoring her indignant squawk. He was too eager to make her scream to go at her coy, morally prejudiced pace now that she was sober. If they were going to have sex, then they were going to have good sex. He would make sure of it.

With that in mind, he quickly lowered his head to her breasts and took one nipple into his mouth before she could protest, and was rewarded with a deep, pleasure-laden moan as he quickly began to suck on it, circling the areola with his mouth as he massaged the nipple with his tongue.

It was his turn to moan hoarsely when she didn't stay still and resumed bucking her hips, rubbing in circular motions against his needy erection.

Honestly, if she kept this up he wasn't going to last long. Even though he was no longer completely inexperienced, he still didn't have much resistance, while she was moving so fast that even with him fully clothed she was making him feel on the verge of orgasm.

"Hey, lioness..." Senku called out to her in a slow, hoarse voice because of his labored breathing and from the alcohol. "If you want to have fun tonight you'd better slow down a little..." he warned as he squeezed one of her breasts in his hand, marveling at its softness.

Her hands were rough and her arms were scarred, but the rest of her was so absurdly soft it was almost scientifically impossible. Or maybe he was just too drunk, one of the two things.

"It's not fair, Senku... " Kohaku was also panting, though no worse than he was. "I barely even remember what happened... that time, this helps me remember a little bit you know?" she rocked her hips again, this time so torturously slow that it brought a hiss from him. "So... let me..." she rested one hand on his chest and slowly lowered it to the protruding bulge between her legs. "Let me remember..." she caressed it shyly, barely brushing it with her fingertips, but that was enough to make him shudder.

Senku chuckled, restraining himself from pushing against her touch like a desperate man.

"Well, I remember everything perfectly, and let me tell you, you didn't do any of this," he grinned cheekily. "And I don't think it's a good idea for you to do it either, if you want to have fun tonight."

"B-but I want y-you to have fun a-as well…" she confessed with a red face, surprising him. "You... I remember you..." she stammered, unable to say what was going through her mind.

He raised an eyebrow.

"Do you remember that I gave you oral sex?" that confused her, she didn't seem to know that term. "I mean..." he sighed in disgust. "You mean when I put my hand and mouth here," he lowered his hand to her crotch still covered with her underwear. Her face was practically smoking, she nodded. "Do you want to do that with me?" he asked incredulously.

"Can I do that? Or is it something you only do to a woman?" she asked innocently.

Ignoring his sudden urge to kiss her again, he shook his head.

"You can... but..." Honestly, he was hesitant to hold back without cumming, but he didn't want to say no if she was so willing.

Well... he could always try to hold back as long as possible and when he couldn't hold back any longer, he would just stop it.

"Wait," he motioned for her to step back and stood up to take off his clothes, standing completely naked before her embarrassed gaze.

He laughed at the sight of her. Maybe he was already too exaggeratedly drunk, but she looked a little adorable right now... Nope... yeah, that was definitely the alcohol speaking for him.

He sat back down on the bed across from her, who was making a lot of effort not to gawk at his erection.

"W-what should I d-do?" she stammered without even looking at him.

"First... take that off," he pointed to her underwear.

"EH?!" she gasped in shock, but then she bit her lip and stood up, bringing her hands behind her back to untie the knot of her prim underwear.

Senku didn't even bother to hide the way he was looking at her with too much interest, even though he knew it made her uncomfortable. He honestly couldn't force himself to take his eyes off her. Once she untied the knot, it was a matter of her parting her legs a little so that her last garment fell to the floor, leaving her completely exposed to him.

"N-now what?" Despite everything, she stood proudly on her two feet, chin up as he studied her up and down.

Shit, he really couldn't wait to hear her squeal again as she squeezed him between her vaginal walls.

"Now...come here." He beckoned her closer as he crawled backwards on the bed, leaning against the headboard.

She got on her knees on the bed and crawled over to him, giving him a good view of her whole body swaying awkwardly on the mattress as she climbed on top of him until they were face to face again.

"Now, I'm going to show you something absurdly simple," he whispered against her lips, before kissing her again.

As he melted her mouth to his, he took her hand and guided it to his pulsing member, urging her to wrap it around his girth. She twitched slightly, but did not break the kiss.

Distracting her with the kiss to help her cope with her embarrassment, he began to help her masturbate him gently, urging her to squeeze only gently because if she squeezed a little too hard, it would be goodbye to any remote chance that Tsukiku might ever have siblings. Not that He wanted any more children, but he didn't want this first time to be the first and last, thank you very much.

After a couple of minutes whispering between kisses what to do, he released her hand to go on alone, groaning in pleasure when she rubbed his glans with her thumb, just as he told her, then kept moving down and up the length of his member, remembering to do that every now and then. As expected, she was no less diligent about this than when she had to follow his directions on some scientific work, and she was no less grateful than on those occasions.

They broke the kiss so she could concentrate fully on her task, and Senku almost choked when she increased the speed but without over-tightening and without forgetting to give his due attention to his glans.

Shit, shit, if it wasn't illogical, he could almost say he was in love with this woman, but no, even though he was drunk as hell, he would never be drunk enough to think such senseless stupidity.

Suddenly he felt her blowing on the head of his member and his soul almost slipped out of his body.

He thought it was accidental, but seeing her pleased smile after noticing his reaction almost made his eyes pop out of their sockets. Where was the shy girl?

Heh, he'd forgotten he was dealing with a lioness here too.

"You learn fast eh, lioness?" he whispered almost faintly at this point, straining not to ejaculate like a pathetic little boy into her rough but warm hand.

She frowned suddenly.

"Stop calling me that or I'm going to stop." Despite her very bold action earlier, she now looked completely embarrassed, stopping her hand movements on his latent erection.

He chuckled, a little thankful for that since if she kept going he wasn't sure he could control himself, but then he felt her completely pull away from him, getting up from the bed and all. He hissed as he felt her absence almost painfully and immediately went after her.

"Okay, fine, I'm sorry." Not caring about sounding urgent for once, he took her hand and pulled her into another kiss, this time deeper and more desperate, almost begging her not to leave him like this. "Go on, Kohaku... " he begged before kissing her again.

Without breaking the kiss, as their tongues tangled, they returned to the bed and she wrapped his member in her hand again, following with a much slower movement. He broke the kiss to sigh shakily, frowning when she stopped again after another couple of minutes.

"Hey, Senku... now what... what's next?" she asked, her face was surprisingly even redder than before.

"What's next what?" he looked at her incredulously.

She wasn't talking about what he thought she was talking about, was she?

"How... how do I use my mouth too?" Okay, shit, yes she was talking about that.

"Please, Kohaku, that's not even so hard to imagine…" He looked away, not wanting to admit that he loved the idea of that but didn't want to do it because he doubted he'd last more than thirty seconds.

"A-also... do you also have to... lick and stuff?" Her face could well pass for a Christmas decoration now.

"Well... partly, yes." Shit, he felt like an innocence abuser right now. And the fact that he was technically three thousand seven hundred and thirty-six didn't help much. Though that was obviously ridiculous, forget it. Alcohol was certainly making him irrational. "Although the most characteristic of oral sex, when done to a man, is to insert it inside the mouth and suck or make a movement from the inside out, imitating the traditional sexual act and that–" he scratched his ear, appearing disinterested while she looked at him with those big blue eyes full of innocence and confusion.

"I understand." After a few minutes, she sighed and spoke with surprising calmness. "Very well then," she turned away from him and lowered herself down until she was facing his bent legs, using her hands to spread his knees apart.

Ah? Wait, was she really going to do it? "W-wait, lioness... I don't think this is a good idea," he broke out in a cold sweat.

She frowned at him.

"Just for calling me a lioness, I'm going to do it no matter what you say," she mumbled spitefully.

And then she took him in her hand again, getting so close that he could feel her breath on his glans again, making him tense up. She hesitated only for a second, before opening her mouth and poking her tongue out to touch the tip of his penis briefly, before pulling away as if it burned, while he simply shuddered.

She blinked dazedly, cocking her head to the side.

"What?" he asked dryly, refusing to acknowledge that his face had risen considerably from its normal temperature.

"That's...not so bad, though it's weird." She moved her tongue closer to his member again, this time giving a longer lick to his glans now coated with pre-seminal fluid. She seemed more surprised that time. "That's weirder," she spat a little, making him laugh.

"If you find that disgusting, you'd better stop now," he shrugged his shoulders. "I didn't even ask you to begin with."

She frowned.

"You're defying me?" she raised an eyebrow.

He looked at her incredulously. Where the hell did she get that from?

"Of course not, you idiot, I'm just saying–" he interrupted himself, stifling a scream when she suddenly shoved the whole girth and a little more into her mouth all at once.

He gnashed his teeth and threw his head back, not caring about giving himself a good smack against the wall, grunting as he squirmed to keep from cumming on the spot.

She held him in her mouth for a good ten seconds before slowly pulling away, letting out a gasp that almost ended up killing him. He must have looked really pathetic now, panting like he'd just run a marathon, his chest heaving violently up and down and covered in sweat from the sheer effort of not cumming like a thirteen year old pubescent boy.

Yes... he must have looked pathetic, but for some reason, Kohaku right now was looking at him like he was some kind of irresistible sex god, her eyes so obviously charged with desire that for a moment he feared for his physical integrity.

She was definitely not going to let him get away with this.

She wrapped her mouth around his member again, this time sucking on it gently for a few seconds before pulling away again. That almost killed him too, he moaned from the back of his throat, still struggling not to cum.

"How do you like that, huh?" Kohaku spoke, sounding very pleased.

Senku clicked his tongue.

"I assure you it's common knowledge in my day that almost all men love this," he tried to laugh, but he was too out of breath to even manage a smile that would last more than a second.

"Well, this isn't your era, I didn't know that. You should have said so sooner," before he could answer, she took him into her mouth again, this time lowering her head a little more, slowly inserting more and more centimeters until she almost had half of him inside. Suddenly, a small explosion of semen burst in her mouth, making her pull away with a jolt. She quickly spat it out. "What was that?" she asked, wiping the corner of her mouth.

"You don't know what semen is either? Where do you think our daughter came from, from a fucking stork?" he asked frankly irritated, because this time he almost came like an idiot.

"Of course I know what it is," she looked at him indignantly. "But you're still hard," she pointed to his still erect penis. "Wasn't you supposed to...?

"I was about to, but I managed to control myself..." Finally catching his breath a little, he pulled himself up a little, albeit very weakly, and leaned his head on her shoulder. "Listen, Kohaku, as much as I love what you're doing, I won't last long if you continue like this. And I wouldn't want to leave you wanting so... what do you say we go for the jackpot?" he brought a hand to her vagina, rubbing her clitoris gently with his index finger.

He heard her gasp, but quickly returned him back against the mattress.

She smiled a little cheekily. "If you like this so much, I'm not going to stop now..." she moved back down, resting her breasts in his lap as she took him into her mouth again.

This time she went beyond just the tip and beyond just half of it, she took him almost completely into her mouth, and not to brag but he was well above the average Japanese size, so apart from killing him, he was quite surprised.

Kohaku stayed that way for a couple of seconds before pulling her head up until she withdrew it completely, catching her breath as drops of his pre-seminal fluid and saliva dripped from the corner of her mouth. When she came back down to the point where her lower lip actually made contact with his testicles for a moment, Senku arched up completely, biting his lip to stifle a scream as he violently cum inside her mouth, not even being able to warn her to pull away.

She pulled away coughing, spitting most of it out, but then had the nerve to run her tongue over her lips tasting the remnants left there as if she purposely wanted to finish him off.

Okay, he was definitely dry, no more fun for tonight.

"Okay, I hope you're happy," he said in between deep gasps. "The fun's over," he was exhausted, not long to go to sleep.

"I know, I know," she shrugged. "It's better this way, since we don't run the risk of giving our daughter a brother," she was obviously wet and eager for attention, but she was taking it surprisingly well. "The older women educated me a bit for this, in case my husband was insufficient and didn't measure up to please me..." she sat with her legs wide open and her knees bent. "Sleep if you want, I'll take care of it," she brought her fingers to her sex, gently rubbing her clitoris.

Insufficient husband? Not measuring up to please her? Sleeping while she masturbated?

His eyebrows quivered with indignation, but as he heard her sigh at her own caresses the indignation turned to desire, desire to shut her mouth with cries of pleasure.

Thank god for his adrenaline! It gave him strength, and miraculously his erection had returned, ready for another opportunity.

Kohaku stared at him in bewilderment as he sat up with his eyes darkened with desire, and before she could protest he lunged at her.

Okay, Kohaku would admit that she had been toying with him to bring his ego down a bit, and while a part of her hoped that seeing her touching herself would make him feel like continuing, She didn't expect her comment would trigger his desire for revenge.

Because he did have his revenge, and in spades.

Right now she was holding her own legs to keep them as high and apart as possible, lying on her back not bothering to stifle her cries as he sucked furiously on her clit, sometimes licking it and sometimes biting it as four of his fingers moved in and out of her insides with a speed she would never have believed from Senku.

He was honestly tearing her apart, she had already cum three times and he was still tireless, sometimes switching to penetrating her with his tongue as he twisted her clit between his fingers and sometimes touching a spot on her that made her scream so loud it was painful.

Agh, she hoped no one heard her, but the truth was she really didn't care anymore.

Fourth orgasm and a few tears escaped her eyes at how good it felt. She was a mess and the worst part was that she knew Senku was enjoying it.

"Do you still think I'm an insufficient husband, lioness?" he finally pulled away from her, panting heavily with a cocky smile on his lips glistening from her fluids. Still trembling from her last orgasm, she shook her head. "Okay, all right, now do us a favor and go ahead, will you?" He dropped down beside her on the bed. "I'm all fucked up, but I'll try to hold out a little so you can have at least one more orgasm, do you feel like it?"

Truth be told, she was also quite exhausted, this sex thing was even more tiring than the most intensive of workouts, but just a glimpse of the erect member waiting for her made her quickly make her decision.

She quickly positioned herself on top of him, but took her time to slowly insert his penis inside her, enjoying the feel of every inch of the hot, throbbing member. The sensation caused her a little discomfort at first, but the pleasure was much greater and anyway it was nothing like the first time, it was even a relief to finally have it inside after so much preparation with his tongue and fingers cruelly playing with it.

When she felt him fully inside, she let out a big sigh, closing her eyes to revel in the sensation for a moment. It wasn't long before he grunted and jerked his pelvis to urge her to move, wrenching a deep groan from her.

Although it didn't hurt and the discomfort was going away, she did feel very full and was even a little unsure of what to do.

Groaning softly, Senku brought his hands to her hips and with weak movements began to make her move up and down slowly, without lifting her or exerting any force on her, of course, just guiding her.

It wasn't long before Kohaku found her own rhythm and let herself go, panting heavily and moaning every time she felt him bottom out, resting her hands on the mattress at the sides of his body as she increased the pace slightly. She growled from deep in her throat as she leaned in a little closer and felt him at a different angle.

He moaned hoarsely, taking advantage of her having moved a little closer to rest his hands on her breasts, squeezing and twisting her nipples with the pads of his thumbs as he massaged her breasts, wringing more pleasure-laden sighs from her.

They were both sweating profusely, a complete panting, desperate mess. She was quite tired and Senku was barely conscious, forcing himself to last longer to please her. That little detail brought her some warmth that had nothing to do with sex, but somehow made her feel even better as she crossed glances with him.

She felt the sudden urge to kiss him again and didn't hold it back, stopping the pace of penetration altogether but keeping him inside her as she leaned over him, crushing her breasts against his chest and grabbing the back of his neck to tilt him forward and bring their mouths together.

The new position didn't allow her to go that deep, but the kiss felt so good that she decided to endure it, taking a much slower pace that he faintly reciprocated, running his hands all over her back and hips, tracing her ribs and sliding up her thighs until he moved up to her ass, massaging her buttocks for a moment before moving one hand down to her vagina and gently brushing his fingertips over her clitoris, making her shudder in the midst of his kiss. And, even though the sensation was not as erratic and hot as it was when she jerked desperately on him, the feel of him completely glued to her, the feel of his heat as she kissed him with such passion but with some affection, that was what made her break once again.

She didn't pull away as she felt the waves of pleasure engulf her and tear her apart, choking back a silent scream in her mouth from how breathless she was as she trembled helplessly like a leaf in the wind, closing her eyes tightly as she felt him break too, burying a hand in her hair to keep the kiss going as he cum inside her.

Once the overwhelming sensation of infinite pleasure faded with an almost torturous slowness, they finally broke the kiss and she collapsed on top of him, both panting desperately.

Suddenly, as the haze of pleasure stopped completely engulfing her thoughts, she realized what they had just done.

Okay, Senku was drunk, but she shouldn't have let this happen, being the sober one here. And she was sure that tomorrow would come the harsh regret, just like last time.

That thought shattered all sense of happiness and comfort as she pulled away from him, lying down beside him with her hands pushing away the hair stuck to her face from sweat. She turned to look at him, noticing him completely exhausted and about to fall asleep.

"I'm sorry..." she murmured as she looked at him, making him turn to look at her with confusion. "This was a mistake. I'm sorry," she whispered, aware that perhaps she had once again jeopardized his plans. And her own plans, for that matter.

He frowned at her, before turning away abruptly.

"Don't worry about it," he mumbled, sounding completely out of breath. "Sleep, tomorrow we can yell at each other all you want."

"I don't want to yell." She gave him a dirty look, even though he couldn't see her. "I just wanted to tell you that I'm sorry, I shouldn't…"

"Provoke me to fuck you? Yeah, you probably shouldn't have, but like I told you... I'm not the innocent poor victim," he chuckled, while she was thankful this time that he didn't see her, because her face was on fire now. "Do us a favor and go to sleep, tomorrow there will be time to repent for this "mistake" as you like to call it, you can claim all you want then. Now shut up and let me sleep, I feel like shit."

She frowned at him.

It hadn't even been ten minutes since they shared that kiss that made her completely lose her sanity in more ways than one and now they were both already regretting it so bitterly that she even felt like hitting him and hitting herself.

And she was only dealing with the still-drunk Senku.

Who knows what he was in for when dealing with the sober and hungover Senku tomorrow?

She sighed and turned her back to him as well, closing her eyes wishing to fall asleep fast, which shouldn't be too hard since she was so tired from taking care of her newborn baby girl who was taking so many hours of sleep from both of them lately.

What they did wasn't bad really, except for the part that she might get pregnant. They were already a married couple so at least it wasn't dishonorable behavior, and for a moment, with that kiss... it really felt like they were a real couple, if only for a second.

Involuntarily, a small smile surfaced on her face at the thought of that, but she quickly mentally slapped herself and dismissed that idea.

As they both rightly said, this was just a mistake. She shouldn't have these kinds of thoughts or feelings...especially since she knew he didn't.

The end.


Author Note: Hi! :D

This is a translation of my fic named the same and a spin-off of my fic Baby Stone that is also being translate!

SyrinxSilenus is the wonderful translator! All thanks to her!

We really hope you like this! Thanks for reading! uwu

CELESTE kaomy out!