A notification?

During the first hour of writing, you find yourself getting lost in the questions and answers. You get into a nice rhythm, and feel confident in your answers.

Suddenly, you feel a short buzz in your crotch that makes you jump. "Eep!" A few students turn to look at you, but you offer a hushed "Sorry..." and they turn back to their pages. At the front of the room, the professor and assistant don't even register the sound. That felt like some sort of notification vibration... In a panic, you look down, breathing out in relief when you see that your disguise is still intact. You briefly wonder what that was, but decide to focus on the exam.

The buzz happens again two more times over the course of the exam, each time short but insistent. Not enough to cause pleasure, just to get your attention. You manage to put the distraction aside and finish the exam with 20 minutes to go.

Tossing your writing supplies back in your bag, you peel your warm ass off the seat, ignoring the stares, sling your bag over your back, and quickly walk to the front. Handing in the paper, you thank the professor and step outside the classroom, pulling the door shut.

As soon as you do, you reach behind you into your bag and pull your phone out, turning on the screen to see what was happening.