Tease her a while first.

"I dunno... I mean, I got Yang here," he joked, palming Yang's ass, and making Yang coo.

Nora's eyes widened. "H-hey, wait a minute!"

Jaune however proceeded to turn towards Yang and start kissing her, and they moaned as they made out, Yang stroking his dick where Nora could see it.

Nora whined and strained against the ropes. "Come on, I need your dick in me Jaune..." she whimpered.

"Just wait your turn," he joked as he groped Yang's boobs.

"I can't wait that long!" she whined, but stopped straining due to her obedience.

"She's getting a bit noisy," Yang said, playing along with the teasing and torturing Nora idea. "...maybe we should go back to our dorm, leave her there a while..."

"Yang!" Nora protested, weeping comically. "I thought we were friends!"

"Oh we are, but this is a hunk I want aaaaalllll to myself," Yang laid it one a little thick, watching Nora bite her lip and quiver.

Jaune smirked and turned to look at Nora. 'Was that enough teasing?' he wondered. 'I could always straight up fuck Yang in front of her, but I might actually break her...'