I made my obedient, big-breasted sister, who lost a lewd game, wear a slutty outfit and have unprotected sex with her breasts. (PPPE-275)

Yu, a social misfit who stays home playing erotic games, spends his days playing them. He wants to put his gaming skills into practice in real life, so he decides to experiment on his sister. They decide on a game where the loser has to obey the winner as punishment. Yu wins decisively, and he makes his sister wear lewd clothes…