[The first collaboration between F4U, the geniuses of modern erotic fantasy!] A teacher who is unaware of the ejaculation control system partners up with Momonuma-san, a girl with glasses who is left out in the classroom. The teacher is confused by the sudden ejaculation control, but accepts it for the sake of his student. However, contrary to her plain appearance, she is a super perverted slut with amazing techniques...! In the classroom, the library, and at home, he is constantly being fucked so hard that his dick becomes numb! "If you can hold it in, I can put it in?" Every day, the insatiable girl milks his balls until they are empty!