While Kaoru and Yuuji were visiting Yukio's house, Kaoru headed to the bathroom and stumbled upon Yukio's mother, Yuri, engrossed in masturbation. Frozen in place, Kaoru is tempted to blackmail her, demanding she do something for him in exchange for keeping her secret. Overcome by pent-up desire, Yuri easily agrees. In that moment, their forbidden relationship takes a sudden, intense turn.