OVA Yuugao Episode 1

Every night, Tomoe Hyodai has nightmares in which she has sex with some fat, horny student in her office. Catching the horny looks of her students, she inwardly despises them. And then she saw him, the one who had sex with her in her dream. His name was Nemoto. Although Tomoe clearly shows her contempt for him when he calls her to a private room, she can’t contain her excitement and follows him… Because of her promise to delete a pornographic video of her sister, Mizuki is sexually abused by Tanabe for two days. Even though the pills he gave her were supposedly birth control pills, they made her even more aroused. Mizuki continued to have sex with Tanabe until one day he took her to a VIP lounge, where Mizuki witnessed a scene of several female students from her school having an orgy with numerous men. To her horror, her favorite sister Aika is among them…