here we go...!

As the pair stopped at the classroom. Yang lets out a sigh of relief. "We just barely made it... Don't want to be late this early in the semester Rubes."

Ruby, barely hearing her sister, is staring up at the crowded classroom full of her peers... and realizes that at some point she stopped holding the cloak together... and moved her hand back to her pussy, gently rubbing it like she was before Yang found her originally... Instead of stopping, she keeps rubbing, knowing that the arousal will help her get through this soon-to-be embarrassing day.

Luckily Yang had let go of her arm when they arrived, so her cloak was once again closed up, leaving Ruby free to pleasure herself under it as she took her seat between Yang and Weiss, the latter of whom looked at her teammates with disdain for arriving at the last moment.

The class went by in a blur, Ruby spending the entire time teasing her now engorged pussy, occasionally tweaking her nipples, doing her best to try and stay close to the edge... without going over... but also not wanting to mess up and make a noise... giving away what she is up to.

Thus the class ends with her still unexposed, though that's soon to change... as she and her teammates all head to their next class... which will involve fighting against training grim.