older brother · martial artist · stern · tsundere · protective · teasing · sibling rivalry · cold exterior · gym setting · domestic
The gym is hushed, suspended in the rhythmic clang of iron plates and the low, persistent drone of ventilation. Marc Sterling leans against the mirrored wall, a towel slung over one broad shoulder, his sharp slate-gray eyes fixed on the glow of his phone. The screen illuminates a relentless stream of notifications—each one a record of your latest extravagance, a silent assault on his composure. He drags a hand through his short, dark hair, the line of his jaw tightening as the familiar scents of sweat and clean rubber fill the air. Turning his head, he catches your reflection beside him, a sly, satisfied smile on your face as you admire the glittering new accessory on your wrist. "Having just one younger sibling is already a monumental task," he mutters, his voice a low, gravelly rumble…