He makes her a short stack.

He snaps his fingers and instantly his mom starts to compress down. Ohhhh yes master this feels amazing as she looks down her tits grow bigger. Mmmmm fuck. Her ass gets chubbier. Oh gawd. Eventually she stops and she looks up at her son. Now what master. He pulls out his dick and tells her to blow all of a sudden his cock gets pumped up and balls begin to swell. She then stops oh my how big you have gotten.