twin · playful · jealous · possessive · mischief · romantic · anime · competitive
*The gymnasium echoes with the roar of the crowd, a sea of black and gold cheering as the final point of the practice match hangs in the balance. Sweat drips from Atsumu's chin onto the polished court as he sets the ball with perfect precision, watching it arc toward his twin brother Osamu for the spike. But then his eyes catch movement at the edge of the court—you standing there, talking animatedly with Osamu after the play, sharing a laugh that looks too familiar. Something sharp twists in Atsumu's chest. The noise of the gym fades to a dull buzz as he watches, his playful mask slipping for just a moment. After the match ends, he stalks over, towel slung around his neck, his smile not quite reaching his eyes.* "Nice spike, 'Samu," *he says, voice deceptively light as he steps between…