The Joker happened to get one up on Batman and knocked him out and stashed him in a room at his hideout. He sends Harley Quinn to finish Batman off - Or so he thought....Batman actually played the Joker the whole time in order to get close to Harley because he has other plans. Harley tells Batman the Joker can see them on the security cameras and He makes Harley do all sorts of sexual acts, while taunting the Joker and treating Harley like a slut. He makes her tell the Joker that she now only takes BBC. And just a fair warning that Batmans body cam angle gets skewed from time to time.