On her back, on a desk, before they get interrupted.

Jaune took a moment to look Ruby over, and ordered, "Give me a twirl."

"Okay~!" she obeyed enthusiastically, slowly turning her body, giving him a nice view of her perfect, heart shaped petite ass.

Jaune watched, his eyes transfixed on her. She was absolutely gorgeous. He began to stroke his erection, trying to get a little more blood flow to it to harden it completely. "... you're sexy," he smiled, before ordering her, "Lay back on one of the desks."

"Oh, yes, Master!" she cheered, immediately going to the desk, turning around, and leaning back, scooting a bit to ensure she was on it stably. Tilting her head up, she met his gaze and smiled luridly at him. Without needing any prompting, she parted her thighs, wiggling her hips enticingly as she did, offering her glistening labia up for his viewing pleasure and more. "Like what you see?" she asked him invitingly.

"Yes, I do," he nodded, walking up to her, staring at her most intimate region, completely entranced by it. He then began to trace his index and middle fingers over her slit.

"Oh~!" Ruby gasped in delight at the stimulation. "That's nice, Master..." she murmured.

"I hope so," he replied with a soft smile. "Um... Do I need to wish for a condom or anything?"

Ruby tittered a little. "Not at all, Master! I'm completely immune to STDs, and I can't get pregnant unless you wish me to~! Of course, I'm up for it if you want to knock me up! The baby won't be a genie though, just fully human! Though they might be able to use magic!"

Jaune hesitated at THAT particular thought. The idea of Ruby not even protesting the idea of carrying his child at his discretion was quite a lot. It really showcased just how submissive she was that even a step like that failed to bother her. It was... Extremely hot, admittedly, but also a reminder of just how much responsibility he had with her. She had no capacity to refuse him, and she made it plain that she didn't want to anyway.

"Let's... Take a rain check on that one," he asserted, before reaching down and grabbing her ankles, pulling them up and placing her feet on his shoulders. Then he positioned his cock at her entrance. "I don't think either of us are ready to be parents."

"That's fine too, Master, it's completely up to you!" Ruby giggled, eagerly awaiting his penetration. He proceeded to oblige her, slowly thrusting in. "Oh... About time..." she crooned, a bit of cheekiness creeping into her tone through the pleasure.

He smiled back, moaning at the slick, yet velvety feel of her inner walls enveloping his sensitive length as he went all the way in, holding her shins. He remained fully sheathed in her for several moments, before pulling back out, and gliding back in. He closed his eyes, just taking in the sensations, barely holding himself back from speeding up. He was still new to this, and didn't want to finish too soon.

"Mmmmm..." Ruby murmured, her vagina milking his penis as she gripped the edge of the desk.

Realizing that he was unlikely to last long, no matter how slow he took it, he made a wish. "Ruby... I wish that I could cum several times without needing to rest... And that every time I cum inside you, you orgasm as well."

"Done!" Ruby smiled, snapping her fingers. She then gave a happy little yelp as he began to speed up. "Oh yes, like that!"

Jaune kept thrusting, his eyes shut tight. He was beginning to approach orgasm, when he jolted at the sound of the door being opened. "Crap!" he thought in a moment of panic.