He gives Mary a fetish for being fat.

Rodney straightened up and held the bone out like a conductor’s baton.

“I wish Mary Ocampo had a fetish for being fat. I wish that Mary thinks that what I’ve done is the sexiest thing that’s ever happened to her. And I wish that Mary sees me as a kind, beautiful miracle worker and deserving of my power over her.”

Mary’s expression contorted with the shock of betrayal, before easing into a look of religious awe. She scrambled to her feet and turned to the mirror. It was like she was seeing herself for the first time.

“Thank you! Thank you!” Mary reached around and undid her bra, freeing herself from the tight garment. She massaged her breasts where they were red from constriction. “I understand now… Oh my god, I’m gorgeous! Thank you!”

“I’m glad we could come to an agreement.” Rodney walked up and squeezed the bottom of Mary’s plush rump. She squeaked, turning to him with wide eyes and a red face.

“Can you do more?”

“More?”

“You know…” Mary gestured in a wide circle around her waist. “More?”

“Sure!” Rodney took a step back and help up a bone again. “I wish Mary weighed an even three hundred pounds. I wish she was strong enough to move around just like she could before I transformed her.”

Mary squealed as she ballooned outward. Her yoga pants popped and fell off her in shreds. Thick rolls hung off Mary’s arms and legs. Two pendulous boobs hung down to her smooth, expansive stomach. Mary ran her hand down her side and then around her wide, wide ass. Rodney whistled. Smiling, Mary strode over to the man and grabbing his shirt, pulling him into a passionate kiss.

“Fuck me,” Mary said.