Chapter Text
“Kat, how do I solve this?” I ask my twin, Katsuki, who is working at the desk next to mine. We are working on a homework assignment that’s due next week. I can't believe that we just started the 2nd year and we already have a lot of homework sent home.
“What? Can’t you do it?” he retorts in his usual gruff voice. Raising his head from his own assignment, he walks up to my desk and leans over me, placing his hand beside my notes. I can feel his breath on top of my head as he reads my notes.
He is taller than me, despite being my twin. Other than that, we’re pretty similar: same hair, same skin, same eyes. Damn, even our quirks are alike! His quirk is Explosion—he sweats a nitroglycerin-like substance from his palms and ignites it to create powerful blasts. Mine is called Sonic Detonation—I generate shockwaves through sound by clapping, snapping, or stomping, and those waves explode on impact. It’s not as flashy as his, but it gets the job done.
But if we are talking about our personalities, well… you can’t say the same. Katsuki is, you know, powerful, showy, impulsive. But me, I’m more reserved to myself. I wouldn’t say I’m an introvert, but I always fall under his shadow, so I guess one day I just stopped trying to be the center of attention. Now, we kind of complement each other, being two sides of the same coin. When we team up in hero class, we are unstoppable, but sadly he likes to be with Kirishima, our friend.
“I think I miswrote the formula… It’s not adding up,” I explain to him. It’s hard to stay focused in Aizawa’s lessons; his deep, droning voice always makes me sleepy. Unlike me, Katsuki pays full attention in class, and that’s why he always gets the highest grades. If I were less lazy, I could probably catch up, but I’m fine being the background character. Actually, at school, people didn’t believe we were raised together because of how different our personalities are, but then they realized we are more alike than we let them see. We are just as competitive and perfectionist as the other. That’s definitely a trait from the old hag.
“Look, I could explain it…” he starts, twisting my swivel chair so I’m facing him. We’re really close like this. “But you’ve got to give me a reward tonight,” he finishes with a smirk, spinning my chair back before starting to explain the exercise.
Sometimes I wonder when it all truly began. Maybe it was just a childish dare at first, something we brushed off without realizing what it meant. But even then, there was a spark neither of us forgot. That left a seed of what will later turn into a tree of curiosity.
Over time, with puberty we started exploring more and more what our bodies could be able to do. Some kisses here and there, then it grew into make out sessions, adding some touches we ended up sleeping together more than once. We never talk about it out loud, but we don’t have to, because for us, this is our usual lifes.
Some hours later, the homework marathon had come to a successful close. As we packed away our books and notes, I heard Kat leaving his bag in its place and sitting on his bed at his side of our shared room.
“Alright, sis.” He says, a mischievous glint in his eye, “Wrap it up and get over here.”
I sigh, placing my last items in my bag, ready for tomorrow’s day, and reach to where he is sitting. Getting on my knees without saying a word, I look up to his face and start unbuttoning his pants and lowering his underwear a bit. His shaft is standing tall, and no matter how many times I see it, it amazes me how much it has grown over the years. I lick the tip with my tongue, the sensation of his heat and hardness almost overwhelming. I suck a little on it, gaining a satisfied hum from Katsuki, then I move it along the length, reaching the base. His hair tickles me a little, but I give it no thought and continue working on it.
Circling the base with my hands and pressing it a bit, I decide to start going at it, so I take the tip and reach deeper, feeling every inch. I look up and meet his eyes, finding a hungry look in them. Sucking harder, I earn a moan out of him as he grabs the back of my head and pushes me deeper. I try to trace patterns with my tongue, but with Kat’s hips jerking upwards, it’s hard to even breathe. I feel tears forming at the edge of my eyes, but he doesn’t seem to care as he keeps jerking, using me as a fleshlight while grunting.
His movements become slower but stronger, letting me get some air with my nose before pushing harder. He stops at the bottom, pressing my nose against his pubic hair with a smell I don’t quite enjoy, just to then feel liquid burning my throat. He keeps me there until I can’t hold any longer, and with spots in my vision, he releases me, letting me gasp for air. After a few gasps from both of us, I spit what’s left from my mouth and look up angrily at him.
“You asshole,” I hiss while cleaning my tongue with my hand and then into his leg.
“What’s that for?!” He says disgustingly.
“I almost passed out; you should be more careful!” I get up and go straight to the bathroom. Luckily, it’s right in front of our room, so when we need to clean up after… You know, we can get there without crossing our parents.I brush my teeth and tongue, making sure to get all the excess out. I see through the mirror my brother going to the shower, getting fully naked next to me. It’s been like this for years, so I don’t even bother anymore. As I took a shower earlier today and it’s already 10pm, I do my skincare while Kat showers, obviously turning off the light when I go out to our room. I can hear his complaints as I close the door.
Before I get into bed, I get my uniform ready for tomorrow and some stuff I forgot to take with me to the dorms. As it's the first week this year, they've let us come back home to take all the things we've forgotten at home, but starting tomorrow, we'll live full time at the dorms again. Once everything is ready, I flop into bed and quickly drift off to sleep, resting for the awaited tomorrow.