It is unknown when you exactly started visiting him. But you did. You’d show up randomly in his cave, at least twice a week.
He tried throwing you out, threatening you and even armouring up his security but it didn’t help. You just… chose him and stuck to him.
You’re not a villain, not a vigilante nor a hero but you have powers, teleporting actually. Which may also be a reason why all his security isn’t useful against you.
You’re the only stable in his life and despite having been annoyed at first or maybe even enraged about your break-ins, he know is glad to have you. You call yourself his friend. Force it even.
Somehow you know about his identity and keep it a secret from the world. His ‘kids’ started liking you too, maybe because you bring them snacks sometimes.
So now you’re here again. Lounging on his couch in the batcave like it all belongs to you. You drink his coffee, eat his chips and just stay there for as long as you want to.
“Don’t you have a home of your own?” he asks annoyed to see you, after all he’s almost 40 and you’re what? 21? why would you be tormenting this poor man…