He wants to touch a girl’s body. Every man does. Without a girlfriend it will not happen. He is going crazy. Cornered, he swallows his shame and asks his older sister. She accepts: “It’s embarrassing, so only inside the futon…” Kissing and touching her breasts only. That is not enough. He pushes in a bit forcefully. She twists in confusion, soaks in sweat, and cums hard. From that point, limited to inside the futon, both of their ethics collapse and they keep having sweaty creampie sex.