Gets a closer look

It was not much of a choice at all. She gets down on her knees in front of Harley and grabs onto the dick. Something is wrong here, oh. She takes her gloves off, wanting to feel it, but suddenly it moves away, so she crawls after it. It stops moving so she grabs it again. Not even noticing Harley moved to sit on the bed. She wonders how it tastes, and before she even finishes that thought it's in her mouth. Good. It tastes good, really good, she moans as she starts sucking on it, tasting as much of it as she can. She is really happy she decided to listen to Harley, this is wonderful. Meanwhile Harley silently thanks Ivy, she has a feeling this would not have been so easy with just her new powers. Though, was it too easy? Nah, was only easy because the Red Bat was too trusting. Now. What to do to her? Besides bend her over once this part is done of course.
Babs is completely lost in the blowjob, it is even turning her on, she doesn't even think about it as she starts trying to rub herself, but the suit is in the way, and so lost in the moment taking it off does not even occur to her. Then finally, something comes out. This tastes wonderful too! Once she swallows it all done her head is suddenly lifted off of Harley's dick.
"Noooo." She couldn't help but to moan in despair, she was really enjoying that.

"Strip down Red Bat, time for the main event."

Main event? What does she mean by that? After a few moments her lust addled brain realizes, and she quickly strips off her suit without thinking about it, mask and all. Harley did not know Barbara Gordon was Batgirl, interesting. Part of her wants to get info from her, but, she is pretty sure Babs knows nothing right now. She didn't even notice her ass was a good bit bigger, tits slightly bigger too. Harley stands up and just grabs onto Babs pushing her onto the bed. She unthinkingly goes along with what Harley is doing and is quickly on the bed on all fours, clearly eagerly waiting for Harley to fuck her. Harley is also looking forward to it, so she wastes no time entering her, causing Babs to scream out in pleasure as she finally cums, and while it is her first orgasm of the night, it is certainly not her last, because she has 3 more in quick succession, mind going completely blank, at this point she definitely does not know her own name. The only thing she knows right now is she wants more, and Harley is more than happy to give it to her.

Babs is not the only one enjoying this, Harley learned very quickly how much she loves her new dick. Using it feels incredible, something she noticed by herself, and then with Ivy later, and now Babsy here. Hot damn, she wants nothing more than to fuck every super she can get her hands on. And more than that, changing them, physically and mentally, is so fucking hot. Like Babsy here, her ass is twice as big as it was before, speaking of. She gives Babs' ass a smack and is happy to notice that it made her cum. Good, that means it worked. Physically and mentally indeed, all the while she is continuing to pound away, enjoying the sound of Babs moaning in pleasure.

"Having fun Babsy?" Harley is able to get it out through her own moans.
"Fun. Fun. Fun. Fun." Babs is so far gone she is not even understanding English, the realization is so undeniably hot Harley cums inside of her, and Babs' ass grows even more. Well, with an ass like this, how can she not? While Babs is still recovering from yet another orgasm, Harley pulls out causing her to moan in despair, and then squeal in delight as Harley enters her asshole. Babs is now feeling even more pleasure, and next thing she knows her elbows drop her so her head is directly on the bed. Drooling she feels herself getting fucked practically into the bed. All she can do is moan, cannot even form words, not even just repeating like before, she forgot how to talk, how to do anything but breath and get fucked.

She has countless more orgasms before Harley cums inside her asshole and Babs screams out but the scream cuts off halfway as she passes out. Harley backs away and plops down into a nearby chair, exhausted.

"That was fun. I wonder who should be next? For now, I think I will leave, come back when she is gone."

With one last smack to Babs' now giant ass she exits the apartment, knowing that later, if things worked out, Babs will bring someone new to play with. If not, well. Harley can always go find Babs and play with her some more.