A few more times ought to break her.

You fuck and cum in her pussy three more times. Harley can no longer speak in coherent sentences, she just moans.

Now that you are near sure she's pregnant, though even if you're wrong, there's always tomorrow, you notice she's smiling, and that her eyes have glazed over. You finally broke her! Her vagina is overflowing with semen. You clean her up, and put regular clothes back on her. Can't afford to be stopped for walking around town with a villian! You take her back to your apartment.

You now have a braindead fucktoy.

You find taking her down gives you too much confidence, though this starts off well. The next day, you quit your job for a high paying one at a local corperation