Titty Slut, and he discovers a boundary.

"Titty Slut Yang," Jaune stated, and Yang felt a shiver go up her spine, before beckoning Jaune over. Jaune acted confused as he walked over, and she came up just high enough to start undoing the buttons on his pajamas onesie. "Yang, what are you doing?" he faked confusion.

"Don't get the wrong idea, I just… need to give you a boob job Vomit Boy," Yang said, blushing heavily. "Ask me why at your own risk."

"Sure, that's fine," he gulped slightly, and she pulled the upper part of the onesie down his torso, and down to his boxers, to which she pulled down and let his dick spring loose. She then stroked his shaft with her hand a couple of times, before moving her breasts to slide it right into her cleavage. She sighed as the nagging urge to do this gave her a bit of relief, but still drove her to continue, and began to work her torso up and down, looking up at Jaune, pressing her tits together.

He moaned as he felt her boobs, and she groped herself, working them on his cock, and he looked down at her, moving his hand to place it on her hair… only to freeze as she looked up at him, her eyes suddenly red. "Don't," was all she said, and Jaune gulped, and lowered his hand, to which her eyes returned to their normal violet shade, and she resumed tit fucking him.