Nah, time to call it a night!

Ruby relaxed slightly, her energy tapped for now. Yang meanwhile lowered her face back down to Ruby's dick, and began licking the flaccid addition clean, hoping she could get it erect again so her Mistress could use her another time. Unfortunately, Ruby was honestly spent, and told Yang, "Okay, let's wrap this up... We should head back and get to bed."

"Aw, but Mistress..." Yang pouted, giving Ruby another longing lick. "Ya sure you can't manage another round?"

"Sorry Yang, I just don't have it in me... It doesn't happen often, but I'm exhausted..." Ruby admitted with a sheepish chuckle, reaching down and pulling her clothes back up.

"I could always use my magic to reinvigorate you..." Yang replied hopefully, sitting up in a kneeling position and giving Ruby yet another good view of her boobs.

That... Did sound pretty good, actually. But Ruby shook her head. "Nah... We'd never get anything done again if we did that every time..." She got up, her legs slightly shaky, and stretched.

"...you make that sound like a bad thing," Yang whined, but also stood, and went to pick up her shirt and jacket. She couldn't put them on, but there was no reason to litter. She giggled a bit as she briefly attempted to put her shirt back on, knowing she couldn't. Her arms simply refused to move in any manner that would allow her to, bound by her own power at her Mistress's command. It was so arousing to know that even if she wanted to, she simply couldn't defy Ruby. Which was perfectly fine, given she didn't want to.

Putting the garments under her arm, she hastened to lead the way back to their dorm. Once in front of Ruby, she put a deliberate sway in her hips, walking a little more slowly, and letting Ruby enjoy the view she offered without shame.

It naturally worked like a charm, Ruby staring at Yang's backside as she followed behind her, and smiling at the sheer level of submission displayed.