It starts great

Chemistry was first period, and Connor bolted out of the car before Joan could do anything else weird. He grabbed his posters and prompt cards from the locker, then headed to class. Joan was already waiting for him at a desk near the back, along with their friend Alison. Alison was, if Connor was perfectly honest, a bit of a wallflower. She was probably the shyest girl in school, and prone to hiding herself behind huge glasses and an array of baggy hoodies. She waved hello silently as Connor sat down. Connor wondered why they were at the back of the class - Joan's normal style was to be right at the front, the keenest student there.

Joan flashed him a quick smile and leaned slightly against him, but before he could say anything the teacher entered.

Do I really want to bring up what happened outside school? thought Connor, and in front of Alison?

It turned out that Joan and Connor were presenting last, so they had plenty of time to watch the rest of the groups stumble through their project presentations and to think about how they wouldn't make the same mistake. As the last pair before them went up to unfurl their posters, Connor felt a hand on his thigh. He glanced at Joan who shot him a quick smile then returned her attention to the front of class.

While the pair at the front of the class mixed up their catalysts and reagents, Joan begun to rub her hand lightly across Connor's groin, without looking at him. He looked at her helplessly, but she refused to break her focus on the front of the room. All the while she kept stimulating him under the table. He checked if Alison had noticed, but fortunately she seemed to be focused on the presenters.

All too soon, the presentation came to its end, and Joan got up and walked to the front of class. Connor opened his satchel and looked through it at random, and desperately tried to think of unsexy thoughts to get rid of his boner. After a few moments, while he prayed for his erection to fall, Joan called out across the classroom;

"Come on, Connor! Don't tell me you've forgotten something!"

Connor tried to control his breathing, and kept looking through the satchel. In a moment, he'd be good to go-

Then someone grabbed his crotch again. He looked up to see Alison leaning against him.

"Forgotten something?" she asked, and gave him a harder squeeze.

Connor leapt to his feet and hurried to the front of the classroom before his dick could harden any further.