His son Yusuke, whose father has remarried and doesn't think well of Mako, who has become a new mother, one day, forcibly rapes Mako and films her with his smartphone, and uses that as a material to threaten Mako and train her to become a tit-fucking sex slave. Yusei's training escalates, and while her father is away, he and a DQN senior restrain her and make her cum with an electric massager and a vibrator, and then he fucks Mako's big boobs with a senior with a big dick. Mako gradually went crazy as well.