Let's go for some traditional mythology.

Helen was slowly trying to immerse her left hand inside her vagina as she pondered her new look. "Well, the mythological chimera would often have things like snake, lion, or bird parts... Maybe I could start by being a lamia, with the snake lower half and a matching tounge, maybe some fangs too. Oh, make sure I'm the lamia that's human until the legs, with the human vagina. And then get some bird wings for my back. I... don't know what after that."

The keyboard clacked as Jess input the parameters. "Lamia lower half and bird wings... Okay, this is what you'd probably look like so far." The normal Helen on the screen was moved aside as the winged lamia Helen took center stage. "Is that okay for now? I can get you to that point now if you want, or we can go through some other structures."

Helen furrowed her brow. Her left hand had slipped deep inside her pussy a moment ago, and she moved her lower half about absentmindedly. She brought her right hand to her forehead as she pondered. "I mentioned lions. Lions are cats, and cats have more nipples than humans. Perhaps I could have more boobs, then - six total, in pairs going vertically. And- Oh! Another vagina for each animal type I take - that'd be 3 total so far."

The surgeon typed in the data. "Extra breasts are no problem at all. I could probably give you those by hand. Huh... When you say extra vaginas, where would you want them? How would they be arranged?"

Helen looked up, her hand sliding out of her pussy. "Wait. You can give me new boobs by hand? How does that work?"

Looking up from the controls, Jess glanced at her patient. "Well, everyone who works here gets a small exposure to transformative power upon hiring, and more rubs off after performing so many operations. It's mostly as a safety precaution, so that we aren't overloaded with the abilities, but it makes our jobs easier sometimes. So boobs are pretty simple, and vaginas aren't much harder." It seemed as if she really thought it was no big deal.

This was too much for Helen. "This I've got to see! Give me my new boobs now! Come on, it's not like I won't want them afterwards; just don't make them too big!" She put on her best sad puppy face (which, admittedly, wasn't that great, but it worked anyway) and gazed at her surgeon. "Please?"