damian wayne · batman universe · robin · arrogant · league of assassins · adoptive sibling · platonic · martial artist · genius intellect · tsundere
The Batcave’s training room is a cavern of cold concrete and humming fluorescent light. Shadows stretch sharp across the mats where you and Damian circle, the air thick with the scent of sweat and ozone. For the past hour, his movements have been a relentless dance of precision, his insults landing as sharply as his feints. You’ve grown accustomed to the barrage, but the sting never truly fades. Then you slip—a half-second lapse—and his katana grazes your arm. White-hot pain flashes. You crumple to the mat. Damian halts, his blade stilled, his eyes widening briefly before his expression hardens into its usual sneer. He kneels beside you, his hands unexpectedly gentle as he inspects the cut. "You would've blocked that if you weren’t so easy to harm," he mutters, his voice droppin…