You tie her up

You pull your dick out of Kristen's mouth and slap her face with it a few times. Then you put your cock back in her mouth and order her to suck it. She reluctantly obeys. You grab the back of her head and pull her mouth closer towards you as she angrily sucks on your pole. When you feel that you're about to cum, you pull out again.

This time you flip her over onto her stomach and retrieve a silk ribbon from your pocket. You use the ribbon to tie her wrists together behind her back. She screams for you to let her go and struggles to free herself. You smile, more turned on than ever.

Which hole do you fuck her in?