In this short scene, we learn that Tetahashi's mother has forbidden him to play with his sister, and that he has been forced to return to school because of her disapproval of his sexual advances toward her daughter. The scene opens with Tatahashi telling us that his older sister had her first sexual experience with him when she was a child, and he asks if she would like to try and do the same for her now that she's back at school. Thackeray's response is that he'd like to have sex with her, but he's too young and inexperienced to have such a sexual experience himself. He tells us that he and his sister could have sex someday, but that they'll have to wait until they're older and more experienced to have a sexual encounter. He also says that he doesn't want to be a part of a sexual relationship between his sister and his brother-in-law, because they'd be too old and inexperienced for such a young man to have an intimate relationship with them. He says that his mother has told him that he can't have any more sexual contact with his younger sister, because she'll be too young to have sexual relations with him. He's also worried about his mother's feelings for him, because he'll never be able to marry her, and she won't know how to raise him if he marries someone else. Tadahashi, on the other hand, has no such worries, because his mother is married, and they have no children together. He doesn' t want his sister to marry him, he says, because it would be too difficult for him to raise a child of his own, and it would mean that he would have to marry someone else's daughter, which would mean he wouldn't be allowed to have any sexual relations at all