Chapter Text
“That damn alarm..”
The sound of a blaring phone alarm went off in the dark bedroom, filling all you listen to it with alertness, but a growing irritation. It didn't help that the young green haired science enthuristst just had to stay up until 4am to wait for the latest news on NASA from America. Soft male groans mixed with the rustling of a blanket were met with a swift but effective swat at his phone, silencing the souce of his broken, short sleep.
Sweet silence.. Maybe I can get a few more minutes of..
“Senku!” came a muffled, older male’s voice from behind his closed bedroom door.
Goddamit old man..
Senku, much to his unwillingness, slowly sat up in his bed. His once gravity defying hair now slapped across his face, slicked there by unwanted drool. Rubbing his face, he groaned louder, cursing himself for perhaps not recording the live feed to watch later. But how could he ignore it when a possible trip to Mars was in the works? Missing the press confrence taking place in America via live stream would 10 billion percect drive him crazy all day.
“The price to pay, I suppose.” He mumbled under his breath as he lurched over his phone, trying to wake himself up with whatever nonsense his phone would display to him at 6am. MOstly it was just the weather and a recap on the Mars meeting via his social media alerts. Itching the dried drool off his cheek, he took note of how hot it was going to be today, the humidity, and the UV ray’s levels. Why? Because he was dead set on his damned P.E. teacher making them go outside today to, as his teacher annoyingly says, “Enjoy the weather of the youth!”. God, he could even hear the voice accompanying it
Eventually, he mustered the strength to fling his legs out from the covers, relishing the last bit of AC he was going to feel all day. He stood lazily, letting his PJ pants droop off his waistline, barely resting on his hipbone, exposing the first 1/3 of his boxers and the rest of his lean torso. It was hella too hot to wear a shirt to bed. Stretching again, he shook his head to “fix” his hair, wefts of white and green fluffing everywhere, as he began his typical Thursday routine.
Making his way down the hall way, his eyes were still adjusting to the light of his living room, half covering his dakr crimson eyes as he did.
“Damn, Senku, you look like you are experiencing the worst hangover of your life. Turning to substances to thirst you need for knowledge?”, a feminine voice teased not too far from him.
Senku blinked, finally adjusting to the light, and was met with [Y/n]’s dumb smug grin. Her eyes held a sense of playfulness as she sat at his kitchen table, head resting on her cheek. The morning light gently captured her silhouette, letting her [h/c] hair glisten in its wake.
Finally processing the situation, fully awake now, he turned to her, then his father, Byakuya, then back to her, his expression less than thrilled. His eyebrow were half raised, half frowed as he grumbled under his breath
“Who let you in?” he grumbled as he walked past [Y/n]’s smirking face, slightly jolting her forehead with his index finger, pushing it back. She couldn’t help but giggle, rubbing her forehead as she sipped the cold juice his father poured for her.
Senku! [y/n] was waiting for you outside for like 10 minutes. I didn’t want her melting away in this god forsaken heat.”, Byakuya interjected, trying to suppress his grin as he watched the two child hood friends banter. “Besides, I told you that conference would be at 1pm EST. I would’ve had all the updates on it to tell you at a decent hour”
“Aww, but then I would miss this once in a lifetime opportunity to catch Senku with his pants down.” she hummed through a blushing giggle, holding the glass to her lips
“..Literally...”
Senku’s neck snapped in her direction, feeling his ears light up with the faintest red as he huffed, gripping the waistband of his PJ pants and pulling them up to cover his exposed waistline. Byakuya laughed, almost sputtering hot coffee out of his nose. Honestly, it was only [y/n]’s sharp and perceptive eyes that would catch that and be able to get under his son’s skin like that without totally pissing him off. Senku has always been a stoic one, not letting comments or teasing get to him like this. But it was also incredibly rare that Senku even let people into his life to have this opportunity to mess around, rarer still to let them be this close like she was.
“Whoa, Senku! Save it for after marriage! A young man shouldn't be showing off so much skin to a fair maiden. I thought I raised you better.”, his father said, half cursing under his breath as the hot liquid threatening to leave his nostrils
“What ‘fair maiden’? All I see is a pain in my ass who happens to have tits!”, Senku blurted out, still recovering from this unexpected morning’s bombardment of attention as he stormed off down back to his bedroom
“Oh! AND I HOPE YOU GET SECOND DEGREE BURNS UP YOUR NOSE, OLD MAN!"
She busted out laughing, covering her eyes as tears rushed out from laughter. [Y/n]’s soft voice echoed throughout the house as she attempted to recompose her mind. In all the years she’s known Senku, he always lectured her you on the importance of not wasting people’s time by being late, or more specificity, wasting his time. She found it like poetic justice that not only was he making them late, but you got in a good jab. Good day, it was going to be a good day.
“Ah, ignore him. You know how he gets when he pulls all nighters.”
“I think I know first hand about that, yeah. Don’t worry, we’ll swing by the usual cafe’ to get him his ‘Anti Asshole’ juice.”
She sighed, sipping her juice, smiling,
“It won’t cure it, but it’ll make sure he doesn’t get the whole high school to want to kill him from his attitude OR lose the few friends he’s managed to keep a hold of with a dumb comment”
Byakuya smiled at her, turning his back to resume making Senku’s lunch for the day. They both knew the wrath of a sleep deprived Senku. It made his father all the more appreciative that he did have friends that understood and tolerated his antics. But he was especially happy that [y/n] was always close to his side.
The room slowly filled with the morning light of the day. [Y/n] could already feel the sweat beginning to start up under her bust line and thighs, trying to use a napkin to blot the spits under her shirt. Summer was her least favourite season. Her body always ran hotter than most, and after transferring from America 7 years ago from Washington State, her body never truly adjusted to the stupidly strong humidity that came with Monsoon Season. Even anything above 65F would make her melt and want to stay inside. Sighing, she pulled her long hair back with a hair clamp to let the cool air from the Ishigami’s BLESSED air conditioner unit to hit her sweaty back neck
She let out a soft, content sigh, letting the air grace her damp skin, Though it was rudely interrupted as a towel was flung at her face.
“Phffptp-.. WHA-“
“Oi, don’t make weird noises in my house.” a voice from down the hallway came. The green haired scientist smirked as he adjusted his summer uniform shirt. He couldn’t help but laugh a bit as she attempted to grip the towel and free her face from the darkness.
“She’s always like this” Senku mused in his mind, watching her wrangle free, her hair now a touch messed up “Such a brilliant mind, but can be so oblivious to her surrounding”. He grinned, walking behind [y/n] to help fix your hair.
His finger ran though her long, silky hair, letting his hand pat down the static that accumulated from the surprise fabric to her face. He didn’t mind really. While physical contact was pretty low on his things he liked to do, he felt this compelling need to make sure she didn’t make a fool of herself. His finger ran down her hair, scooping up a clump of it and pulling it back into a ponytail that sat high on her head. While securing it with an elastic, he could hear her whines as she struggled in his grip
“Nooooo, you know I hate how ponytail’s look on me. It makes my head look weird!”
A smug smirk tugged on his lips as he finished tying it back. He found [y/n]’s protests to his action a little annoying, but amusing, and.. maybe a little cute. He enjoyed it more when it was him that was causing her to fluster a bit. In his eyes, he’d describe her an intelligently stubborn, fiery girl who hardly let anyone put her down. How she would debate someone to death, show up at your house with some home made desserts when you were sick (even when you told her to not), and insist on late-night viewings of the latest in scientific discovery like it was a damn sleepover to keep you company. He should know. He’s experienced all of it.
“Ah pipe down. Its the most logical style for this long hair you insist on keeping. That, or you could just chop it all off and save me the burden of listening to you complain.”
He playfully reached towards the scissors sitting on the coffee table, snipping it near [y/n]s ear, making her shoot up from her seat with a squeak.
“You wouldn’t dare!! It took way too long to get it this long!” She hugged her hair protectively, feeling urge to cry. [Y/n] could feel her whole face burn up as Senku laughed his dumb sadistic laugh. His laugh sounded like it was bouncing as she relentlessly pounded on his chest, glaring harshly though her pink cheeks.
“W-what? Then I could have a more organic source of rope for my experimen- OW! Stop that was right on my- QUIT IT”
Her playful punching got harder the more he teased [y/n], and as much as she hated to admit it, she felt the urge to laugh with him. It back him against the kitchen counter, trapped against her weight.
“You’re such as asshole, you know that??”
She drew her fists back, idly resting on his chest as her chin found a home on his collarbone.
Senku heaved a bit, both from laughing and from being assaulted by her fiery fists of fluster. While she weren’t exactly Taiju status of strength, her hits could leave a mark if they wanted to. And he had this feeling she were holding back a bit
“Right, well, before you bruise my OTHER peck, shall we get going, [Y/n]?” He smirked down at her “Yknow, before we miss more than half the day?”
...
...
The sun’s embrace was that of the oven itself. Walking down the busy streets of Tokyo, [y/n] and Senku did their best to keep from dying in this heat. Though it was only about 8am, the sun had risen quite high on this June day, making the tempature outside already close to the predicted 80F with 85% humidity.
“[Y/n] what the actual hell are yo doing?”
Her hand gently tapped the top of Senku’s green hair, feeling it in a weird circular motion. Grasping at its tips, she felt its softness, humming inquisitively. He felt a shiver go up his spine, feeling her soft fingers against his scalp. Without even looking at her, he grabs her wrist, keeping it above his head
“Oi..”
“I’m feeling for how humid it is today. Your hair gets oddly more stiff when the humidity passes about 72.6%” you state, attempting to get your hand back “And damn, I could skewer meat on your hair. Must be at least 79%.”
“How observant..” He rolled his eyes, tossing her hand back towards her.
“Well someone has to be!”
Heh. Only you would notice a weird thing like that, [Y/n]. He let out a quiet sigh, resting his hand on his lower hips as he walked with her towards the cafe on the way to school. He couldn’t help but smile a bit, feeling his chest pulsate just a touch. He shook his head, punching his chest.
Gah.. damn gas again. Maybe I should see a Doctor. It's been, like, a year since these random chest swells happaned..
They were already late as hell, so a quick stop wouldn’t change what kind of trouble they'll be in later. Besides, she always had a way of making things.. Interesting for him..
‐-----------------
“Ehhh?? HOW much for a iced caramel mocha?”
“You passed grade 1 right [Y/n]? I’m pretty sure you can read that just fine.”
He shifts his weight to one of his hips as you grumbled at the increased prices of your favourite cafe. Senku picked his ear with his pinky as he let you ramble.
“It was 600 yen only 3 days ago! Now its 800?? That’s crap!”
“Didn’t know you were that cheap, dumb ass”
You huffed audibly, “Its not dumb if its your wallet! I’m not made of money y’know!”
“Oh my god..”
He sighed, pulling out his wallet “I’ll pay for it if it gets you to shut u-“
He felt his hand get slapped at, letting his wallet hit the ground. He stared blankly at the ground, then up at you with a ‘the hell?’ kind of face, his brow narrowed a bit
“The fuck you will. Then I gotta owe you a favor.”
“Heh”. He picked his ear, trying to hold back a smug grin. Trying “Would that be so horibl-“
“Yes” You folded your arms “ I think i can speak for every living creature”
The green haired scientist cackled, running his fingers through his hair as he let a shit eating grin consume his lips
“10 billion points to you then. And my ‘favors’ aren’t as bad as you say”
You raised an eyebrow, putting your bag down on a nearby table inside the cafe. Planting you foot on a bench, you raised yoyr uniform skirt up until it met your thigh. This caught Senku off guard of bit, his laughter dried up as he stared at your sudden action.
“Winter, 2013, we went sledding down the Tokyo Park on the rare time it blizzard. You cashed in a ‘favor’ and wanted to test if adding you ‘speedy juice’ to my sled would make it go faster. It did, and my waist was rammed between 2 trees”
You raised your skirt higher, the waist line of your panties becoming barley visible. So hyper fixated on your point that you didn’t notice other people inside the cafe staring. Mostly, the men. You also didn’t notice Senku’s slightly scrunching face that was getting more and more flustered by the moment.
Mostly from the attention they were getting.
You didn't care. You were hyper focused. In this mode, the rest of then world could eat it.
“Holy sh-” he hushed, lunging to pull her skirt down, his eyes trying hard to stare into yours. “Can you not strip in front of people, you oblivious moron??”
“I’m not stripping, I’m showing you my damn scar on my-”
Blinking a few times, you finally look up past Senku’s shoulder. It was mostly delinquents skipping school, but people were staring at you, eyeing you up and down.
“....Ah.”
Blushing fiercely, you took your leg off the bench and placing it on the floor, eyes to the ground.
Dammit. You got caught in your thoughts. Again.
Senku groaned, rubbing his face as he lead them out of the cafe, almost pushing you out and towards their high school. Giggling, you heard him mumbling a but under his breath
"I am running on negative fumes, didn’t get my coffee..and this girl.."