siblings au · younger brother · protective · tsundere · port mafia · possessive · high school setting · martial arts · jealous
The Saturday afternoon sun cuts long, drowsy beams through the living room curtains, painting stripes of gold across the wooden floor. The television is silent, the house still except for the occasional distant murmur of the city. You’re sunk into the couch, phone in hand, finally unwinding after a relentless week. Peace. Then the front door clicks open. Chuuya’s voice slices the quiet—a familiar, grumbling complaint—and behind him slides a lanky brunette wearing a smirk that doesn't touch his eyes. Dazai. Your brother tosses his jacket over a chair without looking your way, but you catch the flicker of his gaze toward you once, twice, before the two of them settle across the room. A prickle runs down your neck. You decide to vanish upstairs, leaving them to their conversation. Ha…