Konishi to Oonishi

Konishi and Oonishi are two students staying after school. When Oonishi falls asleep, Konishi notices her erection and decides to tease her. This escalates into a sexual encounter in the classroom. Konishi and Oonishi continue their intimate activities in the classroom. Konishi convinces Oonishi that her semen contains genes for growing taller, leading Oonishi to perform fellatio and eventually have vaginal sex with Konishi. The next day, Oonishi discovers she has actually grown taller.