At least there is Cindy, even though he isn't her real daddy. Cindy is fun and makes tasty food and brings her presents to keep occupied with and doesn't mind that she draws on the walls and likes it when she sings and takes her to the place with room to fly most days, and lets her paint him pretty. Pen makes elaborate K'nex structures, becomes quite adept at piloting her helicopter (it has room to fly even inside the apartment), and improves at drawing. She learns the lyrics to a lot of Queen songs. She does not go in the dangerous room or out the dangerous door; she's safe but Mommy isn't here to safe Cindy too and Pen can't do it because she's not a mint. She can do other things, though. She can play and read and eat waffles and paint Cindy.
She paints him most of the time, now, and she sings while she does it.
Tonight, not for the first time, he needs to be painted after dark; he has business with the unfriendly people again. So he brings his makeup out to where Pen is playing in the living room.
Pen puts down her K'nex and goes to sit on him for easy access to his face without skipping a beat in the chorale she's singing. Paint paint paint!
Pen jumps at the sound, making a smear across Cindy's forehead. "Eek!" she squeaks, twisting around in his lap to look past her wings at the intruder.
"Batsy!" exclaims Cindy, half delighted, half admonishing. "Not that I'm not thrilled, but you could've picked a better time."
"Cindy, this your friend who find people?" asks Pen quizzically.
"Nope," says Cindy. "This is Batman. And Iiii would just love to know what - he's - doing here."
"Mm, but why," he says, "that's the question. I haven't even hardly done anything - not like lllast time."
"Not to you," he murmurs. "And yet - here you are. I'm al—most—touched."
"You ruin voice talking growly, not sing pretty," Pen advises Batman.
"Huh," says the Joker, regarding Batman thoughtfully. "You just don't know what to do with yourself, do ya?"
The Joker has a small child in his apartment. On his lap. Doing his makeup. She seems perfectly happy to be there. (If she were scared, this would be much easier to handle.)
She has wings.
After a long moment, he says (still in that growly voice): "He's a killer, you know." Just in case she doesn't. Just in case she cares.
(But she does draw her wings a little closer to herself when he says "fire".)