Don’t even try to see HarleyJ here (actually, it supposed to be batjokes, but something went wrong) :D
I guess, there’s need to be a lil story, yeah? Well, Joker breakes his left arm while doing some crazy shit near Batman, so Bats dresses him a wound and waits for police. Joker arrives in the Arkham and spends just a few hours there till Harley takes him away (forgive me for ooc and injured guards). Aaand then Joker says something very-very gay, puts his left palm to his cheek and makes languid sigh. In that moment Harley acquired some doubts about him and Bats :D
I’m sorry again for my English. This is not my first language, that’s why my thoughts are not so bright.