[Miyahara Ayumu] Imouto wa Mou Miteirarenai! (COMIC Megastore DEEP Vol. 18)

A shy schoolgirl in a uniform confronts her brother, demanding a tight hug that quickly turns into a heated, intimate encounter where she claims his virginity and threatens to ruin his relationships. She teases him with a provocative pose, insisting he be steady while she rides him, her wet uniform clinging to her curves as she declares she'll be his girlfriend. The brother’s shocked reaction and her relentless advances set a tense, forbidden dynamic that drives the entire short manga.