She talks Harley into anal

"Meh, it's not like you're doing anything I don't do with him." She says nonchalantly. Harley looks annoyed.

"Well what won't you do!?" She asks.

"Oh well, I never do anal." She says, putting on an innocent voice, then winking at you.

"Then let's do that big boy!" Harley says to you, and stands up.

"Oh no!" Batgirl pretends to gasp. Harley turns around and stands with her back to the bars, she slides her T-shirt up to reveal her ass. She grabs the bars behind her, pushes her ass against them, and bends over at a 90 degree angle.

"Take it, big boy, it's yours now!" She yells.

Using Harley's saliva as lubricant you slide into Harley's asshole. She's clearly no stranger to having her ass fucked. She holds on tight to the bars so you don't push her over as you thrust your way in. You help her balance by reaching through the bars and grabbing her pigtails. You start thrusting in and out as Harley moans and yells "Oh yeah! Fuck me! You like this Batgirl! Harder! Harder!" You give it to her as hard as she can, and she keeps asking for more. Batgirl gasps and pretends to get upset while stifling laughs.

You feel yourself about to cum.