Make everyone strip!

"Alright, everyone, get naked!" Ruby grinned, immediately pulling off her top. Everyone else blinked slightly, before returning the grin, and starting to undress.

Ren stared. "Um, what?" he asked.

"We gotta do this whole thing nude, duh!" Yang replied as she worked off her shorts.

"...why?" Ren asked, though he, believing them, started to undress as well. Ruby grinned as she finished stripping pretty fast, her erection on full display.

"Oh, it's quite simple! We want a comfortable atmosphere, don't we?" Ruby replied, sitting cross legged as she watched more of Ren's slender but toned body come into view. "What's more comfortable than being naked? And hey, if you can focus on studying while naked with others, you can focus on studying through anything!"

"Oh, that makes sense," Ren nodded as he slid down his boxers, Ruby's gaze fixed on his semi erect cock.

Yang and Pyrrha, now naked as well, giggled at just how easily Ren was buying all of the bullshit. Yang's magic was truly something else.

Blake and Weiss also stripped entirely naked, with the sole exception being Blake's bow. Once everyone was nude, they sat and opened their books, going over Oobleck's lecture.

"You're right, this is comfortable," Ren remarked with a smile, blushing, but not freaking out about the nudity.

Ruby chuckled. "Told ya!"

(Reminder, I update these RWBY branches based on what most recent chapters have the most Likes, that's the voting system. I'll be focusing on RWBY a little less in the future, but still updating, so give Likes to the routes you want to see continue above others!)