Teacher, may I come to your house? A graduating student loitered around my house for three days, turning me into his masturbation pet... Itsukaichi Mei HMN-678

Mei is a high school teacher. Her school is college-preparatory; all her students go on to university. One day, Mei hears some unpleasant rumors. Students have joined a sexual harassment club, taking turns raping girls. Mei calls one of the students to her home to hear his side of the story. The student denies it, saying it's just a rumor. But this judgment is wrong—the students, fearing Mei will discover their misdeeds and destroy their club, collectively rape her. Initially, Mei resists, but is ultimately captivated by the students' beastly penises...