Her owner of course

Batgirl is awoken by someone shaking her, she opens her eyes to see Harley in front of her, she quickly sits up and kneels in front of her Mistress. Wait, Mistress? Why does that feel so right? The answer to that is simple, she is now fully corrupted, the semen has made her the property of Harley, which means she will do whatever her new owner wants. Something she is quickly realizing, she is also realizing that she has a cock now, and it is hard. Lastly, she is learning Harley, unlike Ivy and Selina, has big, heavy, tantalizing balls, but no pussy. A small part of her brain wonders why that is, but the rest of her brain is focused on resisting taking it into her mouth right away, she needs permission first. If she were not so far gone she might question that knowledge, but to her it is obvious, Harley is her Mistress, therefore she needs her permission.

"Hello Batgirl, I see you have learned your place."

"Yes Mistress, I have. May I suck your cock?" Harley laughs at that question, clearly delighted in Batgirl's complete submission.

"Not yet, first, take off your mask and tell me your name." Barbara does not hesitate before doing as she is told, there is no resistance left in her mind, she is fully owned by Harley.

"My name is Barbara Gordon."

"Hmmm. I think we should give you a new nickname. Imma call you Babsy. Now, Babsy, I have a task for you. You need to bring me one of those other bats, I don't care which, I just care that you will help me corrupt them like you have been corrupted. They shall all be mine eventually, so that is why you can pick who is next. Got it?"

"Yes Mistress, I will do as you say." Babsy is already feeling excited about doing so, she just needs to figure out who first. Probably Cass, she might catch on too quickly if she goes for Steph first, both are already noticing something is off with her, but Cass is better at reading people. Babsy looks forward to fucking her in order to corrupt her.

"Perfect, but before you do that, you may suck me off." Babsy's eyes light up and she immediately takes Harley's wonderful cock into her mouth moaning at the delectable taste. Babsy looks up at Mistress Harley with lust and happiness in her eyes, Harley looks back at her with a similar expression, although a bit darker, Harley is taking a lot of pleasure in seeing a Bat be so completely corrupted and hers, she cannot wait to expand her harem. For now, she is enjoying the first hero to join. Batgirl is sucking her dick, the feelings of power and arousal momentarily overwhelm her and her knees almost buckle, but she catches herself and remains standing.

Babsy barely notices, she is lost to the heavenly feeling of taking her mistress' cock in her mouth. That last fuck session with Ivy was enough to fully take over her mind, she irreversibly belongs to Harley. And between that being the case and the divinity of Harley's dick, the blowjob is extremely pleasurable for Babsy. For most of it she is taking it slow, enjoying it, but Harley grows impatient and starts thrusting, Babsy cums without touching herself once that starts. Before too long Harley cums in her mouth triggering another mind-warping orgasm, Babsy almost passes out from the pleasure. But she is able to retain consciousness as Harley pulls out.

"Good work ****. Now, get out of here and do what you were told." Babsy struggles to respond as her mind is still recovering but she manages.

"Yes mistress." With that she redresses herself and leaves as she was told, excited to help spread Harley's influence.