Prompt 51

Hear me out: Either due to a prank originally or them both being genderfluid, Bruce and Kate swap vigilante outfits. Batman is Batwoman for a night and Batwoman is Batman, not that the goons know that. The thing is though… it’s kind of fun. So they do it again, and again. The criminals don’t know if they’re going to get kick in your teeth Batman or shoot your kneecaps Batman, they don’t know if they’re going to get flirt while terrorizing your gang Batwoman or terrifyingly silent while snapping someones leg Batwoman. It’s fun for them, and sometimes on slower nights they’ll swap in the middle of patrol. No one can figure out who the bats are, even in rumors or conspiracy theories. People trying to psychoanalyze them are pulling out their hair, the batkids when they find out are going wild with ideas on how to make it worse. 

Of course, come the Justice League, they continue to do their whole switching vigilante-sonas.