Send Batgirl in as Harley

"What is it?" She asks.
"You go in dressed as Harley and distract the Joker while I find out how he's controlling his army."
"That seems like a good plan!" Batgirl enthuses. She turns to Harley on the ground. "Give me your suit." She demands.
"No way!" Harley squeals holding her breasts, "You'll stretch it out!"
"Give it to her Harley." You insist.
"Fine!" Harley stands up and pulls down the hood part of her outfit revealing her long blonde hair, then she removes her domino mask and hands it to Batgirl. Then she unzips the back and slides out of the suit. Now she stands completely naked in front of you, Batgirl and the hostages. "Happy!?" She says, twirling to show off her body sarcastically. Batgirl pushes her back down to the floor before calling the cops in to take away the naked woman and her thugs. You can here her kicking and screaming about cops being perverts as you and Batgirl go to a back room so she can get changed. She quickly removes her costume. You get a good look at her amazingly toned body and perky tits before she starts sliding into Harley's get up. It was tight on Harley but it's even tighter on Batgirl. Her ass and tits stretch the fabric to their limit. She puts on the mask before pulling the hood up. "How do I look?" She asks, doing her best to imitate Harley's voice. No one would believe that was Harley Quinn but with your help, they will.
"You look perfect, lets go."
You head off to the docks and take up position by a skylight. Inside you can see The Joker, standing on a stage in front of his brainwashed army. You watch as Batgirl enters through the door and takes her position next to him. You use your powers to convince him that the woman standing next to him is Harley and he promptly spanks her ass and laughs. Batgirl does not look amused.