This is the fourth episode of "Makotokashiwagi" and it's about a guy and a girl having sex. This time, the girl is trying to get into the room with the guy, but the guy won't let her in. He's so loud that the girl can't hear what's going on, so she has to smack the guy's pants to make him hear her. The girl is totally grossed out by this whole thing, but she's not sure if she should admit it or not.