[China] Imouto wa Doujin Shoujo Cosplay Kei Ch.1-12 [biribiri]

A shy younger sister in a cosplay schoolgirl uniform secretly meets her older brother in the clubroom, where their playful banter quickly turns into heated intimacy as she begs for more while he struggles to keep control. The plot expands to include a male student and a maid‑costumed girl, whose unexpected involvement deepens the tension and leads to a series of escalating, consensual encounters across school settings. The narrative culminates in a passionate climax that blurs the line between familial affection and forbidden desire, promising further chapters of intense, taboo romance.