[Piero] Suiminkan Ecstasy Kanojo ga Neteru Aida ni

A brother’s obsession with his sister’s voluptuous figure, especially her ample breasts, hardens into a plan when she returns tired from club activities and falls asleep in his bed. He hesitates through familiar domestic rituals, then crosses the line in a disturbing encounter driven by secrecy, jealousy, and her complete trust in him. A later meal makes the aftermath awkwardly tender as he encourages her to face their mother, leaving affection and possessive confidence wrapped around the consequences of what he has done.