MKON-140 Feeling awkward being alone with her friend's younger sister, she turns out to be an amazing little devil!! Insulted for being "too weak," she's forced to have her semen extracted and ejaculated inside her. Kitaoka Karin

Satoru is alone with his younger sister, Karin, at a friend's house. Karin suggests a punishment game where the loser has to obey the other's every word, and Satoru loses. Karin forcefully demands that he "become her personal chair." After Satoru obediently becomes the chair, Karin notices his erection and admires it while verbally abusing him. The next day, Karin approaches him again, and this time they have sex. Satoru is ejaculated on and drained of his semen, gradually becoming her slave.