Mayuki and Yoshio met in college and have been dating for six months. Recently, they moved in together and have a happy life. Since high school, Yoshio has been weak and constantly bullied. Coincidentally, while out with Mayuki, Yoshio ran into Nakata, his senior from high school who used to bully him. Upon meeting Yoshio, Nakata immediately started bullying him in front of Mayuki. He also forced Yoshio to bring Mayuki to his house for a hotpot dinner. Yoshio was so scared of Nakata that he had to comply. They both went to Nakata's house for dinner without knowing that he had his eyes on Yoshio's beautiful and busty girlfriend. Nakata continuously poured alcohol for Yoshio, causing him to quickly pass out unconscious. Taking advantage of the situation, he forcefully made Mayuki give him oral sex. He secretly recorded this scene to blackmail her into serving him sexually in the future. Despite initially resisting, the huge penis, new positions, and wild sexual encounters with Nakata gradually drew Mayuki deeper into the pleasure of sexual ecstasy. Eventually, she lost the feeling of intimacy with her boyfriend and went to Nakata's house on her own, seeking to satisfy her sexual desires with him...