[Kinomoto Anzu] Imouto ga Hitori de Asonde Ita node... (COMIC LO 2022-05)

Yurika's private afternoon of fingering herself through her bike shorts comes to a screeching halt when her brother walks in uninvited, catching her mid-moan with her hand between her thighs. The teasing escalates into a heated sibling showdown—he buries his tongue between her legs until she's cumming again and again, all while taunting that she 'started to love it midway through' their very first time. Spent and dripping, the furious little tsundere kicks him and swears she'll tell Mom, but her threat only covers him finishing inside her, never the sex itself—and he's already ready for another round.