She doesn't notice

Goodwitch saw the hand go up almost immediately, walking across the room to RWBY's table.

"What is it?" she asked, sounding annoyed. However, with her stern demeanor, she always sounded annoyed. For all they knew, she could be ecstatic at her students asking her a question.

Blake steeled her nerves and showed the professor her lab work.

"We, uh...we're not entirely sure how this is supposed to work."

Glynda looked at their work for a few moments and then nodded.

"Well, if you look here..."

She then spent the next few minutes explaining it to them again, using different wording then she had at the start of the class. As she spoke, all four of the girls began to grasp the concept, nodding along as she went through it. Well, Ruby and Weiss understood what she was saying. Blake and Yang were both feeling incredibly turned on, being naked this close to the strictest teacher in the entire school. She dare not look at Yang to check, but Blake was certain her own nipples were hardening against the thin layer of paint covering her chest, making them stand out a bit. She took several slow, deep breaths, hoping to calm herself down.

"Thank you, professor," Blake said once she was done, giving a slight smile. "I think we understand it, now."

"Of course," Goodwitch nodded. She then turned and walked back to the front of the class, moving on to the next student who had a question.

As soon as she was out of earshot, Blake let out a breath she hadn't realized she was holding.

"She was so close!" Yang whispered, placing a hand on her chest.

"Now you know how we felt," Ruby teased.

"Is it bad that I kinda want to do this every day?" Yang asked, looking over at her partner.

"A little," Blake said after a moment's thought, which drew an eye roll from Yang. "But I see where you're coming from."

The rest of the class passed by without incident. They were able to finish their lab in a way that they all felt satisfied with before turning in their results and moving on to the next class.