Change her collar

Jaune changed Ruby's collar. She now stood in a black ruffled bikini top, a black miniskirt with ruffles, with a maid cap on her head.

"Mouisour," she said in a bad French accent. "Vy are ve in Viess and Blake's dorm?"

"Just help me carry the mannequin back to my dorm," he told her.

"Oui," Ruby said.

They took Yang back to the JNPR dorm, and Jaune gave Ruby back her monkey collar. He had to admit, seeing Ruby act like a monkey was an odd turn-on for him. He decided she would be his pet monkey forever, and Weiss, Blake, and Yang would just be his playthings to swap collars on.

He instructed maid Ruby to switch collars, and the change happened so fast that regular Ruby had no time to react as she was turned into a monkey again.

"You get to be my pet monkey forever now, Ruby," Jaune told her.

"Ooookkkaaa!" Ruby said happily. Jaune wished up a bowl of grapes for his new pet, then took Yang's collar off, turning her bikini into her regular clothes.