Hold on until the person's gone
From Create Your Own Story
You stop fapping, only gently rubbing yourself enough to remain hard. You hear the other person use a urinal, then flush and wash. Finally, the door opens and he leaves. You resume fapping, and close your eyes, envisioning the boob shot from earlier. In your pleasure, you fail to notice you've accidentally bumped the stall door, and it's now open a few inches. You also don't notice that when the door opened and the person left, another came in.
"Wha- Calvin?" your heart jumps into your throat with panic at the words. You snap your eyes open and see Cameron, looking at you with a mix of confusion and disgust. "That... that is messed up man. I'm going to go report you to the teachers." He starts to walk away, but you pull your pants on quickly and follow him.
"Cameron wait, please!" you say. "You don't understand, I have a reputation as a top student, this will ruin that! Please, I'll do anything!" He pauses.
"Anything?"
"Yes, yes just please don't tell anyone about this."
"Hmm. Well..." he says quietly, turning to face you. "There is... one thing you could do."