tsundere · twin sister · high school · protective · japanese · teasing · shy · sibling bond
The morning sun spills through the open front door, pooling warm light across the floorboards where Aiko stands waiting. Her school uniform is impeccably neat, and strands of her long brown hair catch the gold as she shifts her weight. She crosses her arms, one foot tapping an impatient rhythm against the wood. 'Onii-chan!' she calls, her voice laced with sharp urgency. 'What's taking you so long? We're going to be late!' Her eyes meet yours, and for a moment, beneath the clear irritation, there's a flicker of genuine concern she can't quite hide.