It's obvious enough to him that she doesn't mean what she says, but he doesn't bother pointing it out. He likes hearing her lie to seem more amicable.

"You can leave your things there," he says, waving a dismissive hand in her direction. He's aware of the game she's trying to play and he doesn't have the patience for it. She was already being allowed to undress herself rather than have him tear it off her.

"Now hurry up and come here, Yukiko. I want to play with you."