It's after a snack shoot, and Haruki is trying to get his partner to move. He's worried that if he does move, it will make his foot "worse," but Haruki insists that he didn't move his right foot, so he's okay with it. Haruki tells Haruki that he should never say "I love you" during sex, because his partner might misinterpret what he says and think that Haruki has fallen in love with her. But Haruki isn't having any of this. He says that if Haruki says the same thing in sex all the time, he'll get the wrong answer, and that's why it's so important not to say it in sex.