[Supe (Nakani)] Mukashi wa Kakko Yokatta | You Used to Be So Cool [English]

A carefree sister surprises her younger brother by appearing completely naked in their shared home, much to his flustered confusion. While she giggles about her lack of self-awareness, the tension rises as her damp, exposed skin and prominent breasts draw his gaze. What starts as a simple moment of domestic vulnerability quickly turns more intense as the physical boundaries between siblings begin to blur, leading to a heated encounter where she teases him with her bare, sensitive body.