[China] Doujin Shoujo Monogatari (Imouto wa Doujin Shoujo Cosplay Kei)

A sudden, intimate encounter unfolds between a sister and her brother, sparked by a playful cosplay session in a school club room. What begins as a playful attempt at school-life roleplay quickly escalates into a heavy, heated exchange of passion. As tension builds, the boundaries of their relationship blur, leading to a series of intense, uninhibited moments that leave them both breathless and overwhelmed by sensation.