Female teacher Jun. He is sober and serious, but has an affair with a colleague's gym teacher because of his weak personality. "That's a pure butt, it's super erotic... Wear these transparent pants and teach me." Creampie SEX until the affair is discovered and the student who grasps the weakness is lured to sleep. "Since you're having an affair, you can have rough sex with us, right?" At first, Jun resists, but... he falls completely into the hands of an unfaithful teenage Namachinpo! ! Deca Ass Trembling Vulgar Iki! !