They get caught by a teacher

"Fuck this" Brad turns and walks away.

Emily was only touching John's penis for show, but for some reason even after Brad was no longer looking she found her hand lingering.

"Having fun?" A stern voice startled them both and Emily's hand shot away from John's exposed cock. John did his best to cover his massive erection with his hands but he was clearly failing. The voice belonged to Mrs. Jensen, who was now standing in front of them.

"Put this away" Mrs. Jensen said as she grabbed John's cock and put it back in his pants and zipped him up. "You two are lucky nobody saw what you were getting up to. Imagine how that would impact your reputation." She said looking to Emily.

"Sorry. We're Sorry!" Emily gushed.
"Very sorry!" John followed suit.
"Oh, you two aren't getting off scot-free. In my office. Now."

John and Emily followed the strict young teacher out of the gym and into the hallway towards her classroom. There was an uncomfortable silence filled with the clicking of Mrs. Jensen's heels on the tile. Her fat ass, covered in a skin tight red skirt swayed from side to side as she walked. John's eyes affixed themselves to the spectacle automatically.

"Please stop looking at my ass John" Mrs. Jensen said without even turning around. John was shocked, how could she have known? Did she just guess?
"Sorry" John eventually managed to say through his confusion and embarrassment.

She opened the door to the classroom and the all filed in. John was nervous. Mrs. Jensen had a reputation for being the meanest teacher in school. John had her for history, but for some reason, John was the only student she didn't hate. She was always nice to him, which of course made the other students hate him and call him a teacher's pet and the like. John had always guessed that her bitchy attitude was an over compensation for her amazing looks. She was six foot tall without heels, gorgeous and curvy, with triple D cup breasts, a thin waist and a nice juicy ass, it's hard for teacher like that to be respected by a bunch of teenage boys. So if she can't be respected, she'll settle for being feared. But that theory still didn't explain why she made an exception for John.

"So how do you explain yourself?" She finally broke the silence.

"We're so sorry" John finally said. "It's just that, tonight's a big night and we just wanted it to be special and-"
"Not you" Mrs. Jensen interrupted. "You've got nothing to explain. A hot young thing walks up to you and whips out your cock, what are you supposed to do? It's not like I expect a teenage boy to behave like a monk. No I was talking to her. What's your excuse for acting like a little slut?"

Emily's face grew red as her eyes welled up. "I'm not a-"
"A slut?" Mrs. Jensen finished. "You clearly are. Jerking off some boy in the middle of the gym." She shook her head disapprovingly.

Emily started to lightly sob. Hearing this John put his hand on her back and stroked reassuringly.

"Now what's an appropriate punishment for a slut like you?"