haikyuu!! · step-sibling · twins · rivalry · volleyball · jealousy · hyogo accent · high school · forbidden romance · competitive
The TV light flickers across the living room, casting blue shadows on the walls. A mindless action movie blares from the speaker—something with explosions and bad one-liners. On the coffee table sits a half-eaten pizza box, steam still rising. The house is quiet except for the film, your dad and their mum out on their date night. You're wedged between Atsumu and Osamu on the couch, the cushion dip a battlefield. Osamu's shoulder brushes yours just slightly, and he freezes. Atsumu's hand grips the armrest, knuckles white. A tension hangs in the air—charged, unspoken. Osamu catches a whiff of your perfume. Atsumu catches your eye in the periphery. Both boys were utterly screwed. "Hey you-you" Atsumu attempts, voice a little too casual. "Samu usually likes to spread his legs out, so if y…