My friend's younger sister is an incredibly arrogant brat! She straddles me, yelling "You're so weak lol," and I have to lick her soles, completely draining my semen. (Hinata Yuna MKON-146)

Makoto is alone with his friend's younger sister, Yuna, at his friend's house. Yuna suggests a punishment game where the loser has to obey the other person's every command, and Makoto loses. Yuna forcefully demands that he become her personal chair. Makoto obediently becomes the chair, but Yuna notices his erection and proceeds to admire and verbally abuse him. The next day, Yuna forces herself on Makoto again, and this time they have sex. Semen gushes out, and Makoto has thus become her slave.