In this adult role-play, Makoto ends up alone with Yuna, his friend’s younger sister. She proposes a game where the loser must obey any command, and Makoto loses. Yuna orders him to become her personal chair. When he obeys, she notices his erection, stares at it, and humiliates him. She corners him again the next day, and this time they end up fucking. Yuna drains him again and again until he is reduced to her obedient slave.