Just straight up invite her, as well as make some default settings to her dials.

"Hold on just a second," Jaune said, grinning as he took out the Note and wrote, "Nora Valkyrie won't be able to tell anyone else about the Sex Note or Jaune's activities in any way without Jaune's permission once he lets her know the full scope of things. She also won't get upset when she finds out about the Note." Upon getting a questioning look, he said, "Just a bit of a precaution. Anyway, I'm thinking we go straightforward with her. It's only fitting, considering her own approach to life. Also, I'm adding a new feature to her dials." With that, he wrote some additional words in the Note, "In addition, whenever Jaune says "Default Settings, to Nora, before setting one of her previously established dials, then her personality will automatically revert to that setting after each session with Nora, however he alters that Dial during. For example, if he gives her Horniness Dial a default of 50, then that will become her normal level of horniness throughout her daily life when Jaune's not having his fun with her, though he can obviously alter her current settings whenever he chooses, as well as alter the defaults at any time."

"Sounds good to me," Yang replied with a grin.

"Nora, you can come in now," Jaune called, and the door opened, Nora walking in, shuddering with some pent up energy, as she had been told to wait quietly outside, though Yang had briefly seen her before he had closed the door, hence her earlier question. He wondered briefly how long she would have held out with her obedience set at 80, which was high, but not absolute.

"Oh, a good amount of you are here!" Nora grinned.

"Yep! We're finally welcoming you to the fold!" Ruby cheered.

"What fold?" Nora asked curiously.

"To my harem to be specific," Jaune grinned.

"Oh? Is that what you call all of your girlfriends!?" Nora asked excitedly.

"Yes, yes it is, we are under him after all. Both figuratively, and in a lot of cases, literally," Yang grinned.

"Yang!" Blake blushed.

"How did you get them to agree to that, come to think of it?" Nora queried. "You're a stud and all, but most of us girls don't exactly like sharing..."

"Oh, I used this," Jaune said, holding up the Note and explaining it to Nora. "It helps that I made them all bisexual, so they crush on each other a lot too. Already made you bi too, if you weren't already," he teased.

"Oh, that's hot," Nora grinned. "You gonna use it on me again?"

"I already did actually. But I'll tell you how it affected you later, I actually have a sort of official invitation for you."