Gif: NO MAN AT ALL (Patreon)

We see the scene from the POV of TIM, a young fellow who is sitting on the couch with a thick book of magic spells open on his lap. His roommate JUDD, a big jock bully, comes in and gives TIM a sneer.

JUDD: Dude, are you in here wasting your time with those lame "magic" books again?

TIM: I'm busy, Judd. Leave me alone.

JUDD: Just look at yourself. Weak, no definition, skinny little arms like a chick. All soft and jiggly... you're no man at all!

As JUDD speaks he begins to shrink, his body taking on feminine new curves, but he doesn't realize it.

TIM: Yeah, not like you, huh? Nothing soft or girly about you.

JUDD is becoming more voluptuous by the second, transforming into a gorgeous female version of himself. He gives his "pecs" a mocking flex, making himself bounce.

JUDD: Hell, no! I'm pure testosterone, total hardbody! Strong... firm... manly!

TIM bursts into laughter. JUDD looks confused, then he finally looks down at himself and gasps when he sees his new physique.

JUDD: What the hell?!

TIM: Aw, just look at yourself, Judd! All soft and jiggly... you're no man at all.

FADE OUT on JUDD's outraged, pretty little face.