The teacher and his student are about to have sex, but the teacher is worried that his sister will be jealous. He asks her to rub his butt to make him feel better. The girl is excited, and the teacher tries to make her feel better by suckling her butt. The teacher says he's not going to go down alone, so he'll go with his sister. He wants to make sure that the girl moans when she's having sex, and that she doesn't moan when they're having sex. He's worried that if she moans, she'll wake up, and he wants her to be quiet so that he won't make her moan. He says they'll do it until the girl falls asleep, and then they can continue.