"Well? Name one!" Ty said.
"I like tropical fish," Lisa said. "I've always wanted to have an aquarium with pretty tropical fish, but that's never happened. I want part of my body to _become_ an aquarium."
Ty was astounded. "How do you envision that working?"
Lisa had an answer ready. "I want you to transform my upper body, neck to waist, making it transparent, and filled with water. It should still feel like skin, though, and I should be able to move normally. My body should keep the water at the right temperature for the fish, and when I breathe, some of the air should bubble through the water, to aerate it. When I eat, some of the food should become food for the fish. And I should be self-cleaning. I don't want to have to partially empty myself out and clean and refill myself."
"I imagine you'll want fish, Ty said. "Do you want to buy them in a fish store, or just have me create some? What kind do you like?"
Lisa answered, "I want you to create them. I like all kinds, so an assortment would be good. Oh, and please make them get along with each other, even if they normally wouldn't. And I want the fish to stay safe in me when I transform out of my aquarium form, and reappear when I transform back. And I should have some plants and pretty gravel and other accessories, to make my appearance more interesting, and to provide places for the fish to hide. That stuff should stay in place when I move around."
"OK, that's a tall order, but I think I can handle it. Do you want to do it now?" Ty asked.
"Yes!" said Lisa, excited that she was going to get another exotic transform. Or semi-exotic, since in this form she would still be mostly human.