[Kakurenbo (Rainbow-zou)] My Big Sister's Semen Server [Doomer Snek]

A boy caught red-handed with his stepsister's panties begs her to keep his secret, and she agrees—on the condition that he become her personal semen server from that day on. Under her thumb, he endures her teasing nearly everywhere: a hidden session beneath the table while their mother cooks nearby, a breathless ride in her bed, and a slow footjob at the dinner table she punctuates with an innocent question about his flushed face. Blessed with impossible curves and a smug streak to match, this big sister relishes every second of holding her little stepbrother completely at her mercy.