[Chiguchi Miri] All you Need is a Big Brother! (Ikenai Koto kamo...) [Team Rabu2] [Decensored]

Fumi, a bespectacled little sister with twintails, claims it's her duty to keep her older brother 'in check' with daily sessions of riding him raw—until she invites her library-committee partner Risa over for a hands-on lesson in pleasing him. What begins as a sloppy blowjob tutorial snowballs into a full group affair, with both girls getting fingered, fucked, and glazed in cum while comparing notes on the smell and taste. Between the possessive sister's teasing and shy Risa's growing curiosity about her friend's brother, this sibling arrangement is one neither girl is in any hurry to give up.