A little of both

As Yang lay beside Jaune, still trying to wait out the remainder of her orgasm, Jaune realized... he wasn't done yet.

He reached around her as they lay side by side, grabbing her breasts.

"Mooooooooaster! C-come on..." she panted "I haven't even calmed d-down yet..."

Jaune simply smirked as he lined his cock back up, ramming it into her.

"MOOOOOOO!" she boomed, as Jaune continued into her, grabbing her nipples and sending milk cascading onto the floor.

Jaune heard the door open.

"I'm assuming--" were the only words he heard, as he turned his head around to see Blake standing in the doorway. She closed the door, then stood over them.

"Assuming?" Jaune asked

"That Yang's back since Nora came charging into the library like a bull... what the hell happened to her?"

Jaune smiled and smacked Yang's ass.

"MOO!" she protested

"Why is she a cow..?"

Jaune smirked "The Notebook can make physical changes. For example... Faunus Girl: Monkey."

"MOOOO--OOH OOHH AHH!" Yang's moo changed to a shriek, as her cow tail morphed to a longer, furrier one. Her breasts shrunk back to their normal size and, while her ears returned to a normal human shape, they grew larger and faced forward, much like a monkey's would.

Blake simply stared in shock.

"Anyway. How'd your time with Ren go?" he asked, trying to talk over Yang's screeches.

"Fine until Nora showed up... please tell me we aren't keeping her" Blake practically pleaded

"You don't want her around?"

"Yang's already very high energy... even more as a monkey" she sighed "But Nora's this times ten. If you insist on having her around, make her like... a robot or a mannequin or something" she sighed, flopping down into her bed.

Jaune looked down at Yang, who was gripping her pillow and screeching like a monkey, her eyes rolling backwards from pleasure. He'd be shocked if she even heard anything Blake just said.

He came inside Yang again, before pulling out. Yang was left panting and whimpering as her second orgasm tapered off.

"What do we say?" Jaune teased

"Mmmhemehhemmm..." was all Yang could get out of her mouth

"Was that 'Thank you Master'"?

Yang nodded, a giant smile on her face. Jaune gave her ass a nice pat before sitting down and facing Blake.