"I'm sure she's trying very hard to hold back. I bet any stimulation and she'll get hard in no time."
"This I want to see. I want to see Miss Mounds with a hard-on." the other girl, Sonia, said.
The teacher went on to explain the subject and Sonia took advantage of a moment when she wasn't looking to signal a plan to Jane on the other side of her.
Understanding the plan Sonia called Miss Mounds pretending to have some doubts about the subject she was teaching. The teacher went to her and listened to her question, but not to the end as she jumped up and turned around to scold Jane, who had reached under her skirt and grabbed her balls.
After that Miss Mounds started to look a little airy, as if she herself wasn't paying attention in class anymore. She definitely couldn't get her balls out of her mind by someone, and it was taking effect so that everyone could see what they had never seen before. The teacher's cock hardened and before long it had gone from a 'snake' dangling between her legs to a 50 inch meat mast standing proudly before her.
At this point all the girls present in the classroom had their dicks totally hard too.