Under the same roof part three Senku x reader (nsfw)
Warnings: mentions of sex, blow jobs, pain kink, pseudo-incest, Senku is really a perv here
First thing in the morning, he woke up to hearing the loud commotion that was the kingdom of science, firmly known as Ishigami village. Senku closed his eyes back and decided to take a few seconds preparing himself for yet another long day filled with sorting out problems and trying to propel the world forward.
How had this all happened? Why had it happened? Those over arching questions rattled around in his head every day, and he knew he was going to solve them. He just sort of wished he didn’t have to sometimes. One minute he had been a collage student studying astrophysics, with late nights studying and way too much caffeine in his system. Occasionally he took a weekend trip back to see his old man, but that was all so mundane compared to his life now.
“Sen?” The grumble came from below him, and his eyes slid open to look down at the girl in his arms. Did he count petrifaction in stone when counting the amount of time you’d been together? He wasn’t sure, so instead of thinking about it he pulled your face up to meet his and locked your lips together, letting the soft sensation ease his overthinking. Your soft hands came up to brace against his bare chest, the exposed skin gliding against his own easily. The feeling of having you against him, so close and so exposed made him grin. His fingers slid from your jaw, finding their way down, down, down until he could dig them into the plushness of your ass, leaving fingernail imprints that matched several others he’d left there.
“Come on, you know that hurts.” Your whine was only half hearted as he pulled you ontop of him, legs spread over his naked hips. You both knew you loved the pain, and that it brought him a lot of joy to deliver small amounts of pain to feed that desire. “Aren’t you supposed to be doing village head stuff?”
“Maybe, maybe I want you to give the village head some head?” The raspy laugh he let out as he pushed your hips together, letting the naked skin grind against each other. Maybe the stone world had some advantages mixed in with the disadvantages.
Disadvantages: no phones, no boats, no maps, anything he needed he had to make
Advantages: he got to fuck you whenever he wanted, without any explanation or hiding it.
Then again, he felt like this was a unique case. He doubted anyone else here was taking advantage of the stone world to fuck their adopted cousin. The old world made you both hide your relationship, simply because it was too complicated. Sure, your uncle adopted him and later took you in as well. Yes, you lived together for a while when growing up. And yeah, he’d fucked you several times in the old world despite all of that. Maybe he’d even started visiting his old man more on the weekends simply because you were there and he could sneak into your room at night.
But now you were in the stone world. And no one knew you were cousins, so he got to date you out in the open, and people politely pretended they didn’t see the hickeys all over your neck in the mornings.
Pros and cons, pros and cons.
He felt you sink down on him, a muffled cry breaching the hand you’d clapped over your mouth. Full pushed inside of you like this, he decided he might enjoy the stone world more.
Now that he was fully awake and active, people surrounded him for guidance on their next steps. It hadn’t been long since they’d taken over the kingdom and people still often needed to know what to do. Mainly of course, he knew he’d find his friends waiting on him in his lab.
Old friends like Taiju, and new friends like kohaku and Chrome.
“Oh dear, looks like something got ahold of her again.” Gen cooed as he watched from the doorway of the lab, looking down at the ground and seeing you make your way through the village. “We really should ask her where that wild animal is and how it keeps leaving all those bite marks on her neck.”
Senku shot Gen a glare, but knew he wasn’t going to be free of his comments anytime soon. Gen had always made it his top priority to not so subtly call out Senku for his ‘sexual extravagance’ as Gen put it.
“Wait, there’s a wild animal that is attacking people?” Taiju screamed as he rushed to the door from inside the lab, looking wildly back and forth as he tried to spot what Gen was seeing. The big oaf didn’t understand that Gen was being sarcastic.
“No,” a long sigh escaped Gen, as it usually did when he had to explain his words to the idiot, “I just meant that Senku could go easy on the poor girl and stop making her walk around with so many hickeys.” He moistened vaguely in your direction, pointing out who he meant to Taiju. Taiju, even with his slow processing, found you in the crowd below.
It took five seconds for his brain to connect the dots. In those five seconds Senku had tried to come up with a quick story, or a fast exit strategy.
“Senku!” He heard the bigger guy scream, his own feet shuffling back warily into the lab. Right. He knew this was a possibility. Taiju was dumb sure, but he wasn’t a total idiot. He had just hoped that if he avoid outright kissing you infront of his lifelong best friend, said lifelong best friend wouldn’t call out the fact Senku was dating his cousin.
Adopted cousin. But still. Taiju was too protective over women to let that matter.
“Listen, Taiju, it’s not— we are in a stone world it doesn’t—“ but his protests died quickly as Taiju ran quickly over at him and grabbed him, roughly shaking him back and forth.
“She is your cousin! How could you coerce a lady like that! I thought you were better than this Senku!” Taiju kept roughly shaking Senku, who was wishing his friend would either shut up or be quieter.
“Wait, cousin?” Kohaku’s eyes flicked back and forth from Senku, down to you. “They don’t even look alike.”
“I’m adopted, I’ve said that!” Senku groaned as he was sure he was getting whiplash from this brutality.
“She was like your sister!” Taiju screamed and sped up his shaking. Yes, definitely whiplash.
“Says who?!” Senku was glad when Chrome broke Araina and him apart, and not so glad when the shaking stopped and his head still felt dizzy, causing him to fall back on his ass in the dirt.
“Dude, are you fucking your sister?” Chrome asked as his eyes warily wandered over Senku, though he still offered him a hand up.
“For the last time. I am adopted!” Senku dusted off the dirt, and looked up at the group around him. “And it’s a stone world. How do you think the e Ishigami village became a village from a group of six people? I’m sure the family tree looks like a circle the further back we go.”
“Well… yeah I guess but..” Chrome was trying to hide how awkward that line of thought made him.
“No, he is right. I think we are cousins.” Kohaku pointed out to Chrome, who was very well known to be in love with her twin sister. “I just think the weirdness is that we grew up with that, you didn’t Senku.”
“I guess as long as it only started after the stone world, we should abide by stone laws.” Gen still seemed to be weirdly enjoying Senkus suffering, which Senku supposed meant he was on his side. “Now if you can convince Taiju of that…”
“So the whole village knows now?” Your voice was shaking, making him feel worse than he already did about the situation. He had kicked everyone out of his lab the moment you came by that evening, saying he needed to talk to you alone. “Sen, this is crazy.”
“I know but it’s not any crazier than when we used to sneak you into my dorm, or when I’d come over when the old man wasn’t home.” His lips pressed down against your jaw, trying to be comforting but ultimately he felt like he was failing.
“It was just nice to be so open about our relationship, while we could.” He had you pushed up against the table in his lab, bodies thumping together as you wrapped your arms around his neck, desperately clinging to him for comfort.
“What, secrecy doesn’t do it for you?” He barked out a laugh, his lips trailing lower on your neck. “Miss when I used to come home from college and your friends would joke about your ‘dorky but hot’ older cousin? How you’d sneak off to pout at me until I had my mouth on your tits, telling you to be quiet?”
“Maybe I don’t. Maybe I like this better.” You huffed, ignoring the way his hand snaked up your front, latching onto a nipple with his fingers and pinching it. The grin that spilled across his face was too familiar to you at this point to surprise you.
“Really? You riding your cousin is fine as long as no one knows?” His words were added to him punching you again, making your body arch into his.
“Yes.” You pretended to sound confident, but the look he gave you knew otherwise.
“Then how about this.” His free hand undid the rope holding his clothes around him, exposing his leaking length to you. “Since everyone knows now, you could break up with me. Or…” his hand pulled away from your chest, and moved to stroke himself, letting small drops of liquid spill onto his fingers. “You could suck my dick, let your older cousin fill that mouth up with his cum, and walk out of here with confidence.”
You fell to your knees in front of him, mouth opening just as it had hundreds of times before now as you took him into your mouth. The long length slid down your tongue, your eyes flicking up to see him grinning down at you, clearly having won this little argument.
“Good, now suck, lil sis’” his stupid nickname made you whine, wanting to point out how that was way worse than calling them cousins, but the hand on the back of your head kept you from it. So instead, you stayed on your knees for him in his stone world lab and let him guide your mouth along him, filling the space with his groans and the noise of you crying on his cock.
