This one is mind control only, no physical transformation, but a goodie in my books!
Old 90s HBO anthology cartoon called Spicy City, the name of this episode was actually called Sex Drive
The plot is revealed as the episode goes on but essentially it is a futuristic world where a mad scientist abducts cyborg prostitutes, 'downloads' their personalities and turns them into virtual reality slaves to be sold to customers. One of the female protagonists is also abducted and reprogrammed to do his bidding.
https://www.youtube.com/watch?v=rJo_dvXP0NY
If you wanna skip to the girls: 2:00, 8:30
Some brief girl-on-girl scenes: 16:00, 20:30