Get out of there

You are embarrassed. You aren't gay, and you don't know why your cock is getting hard.

You turn and run out of the bathroom.

You run for some time, until you are down the hall, around the corner and in the bottom of a stairwell.

You pause to catch your breath, and realize the only thing you can feel is your rock-hard cock, straining to brake free of your jeans. The pleasure streaming from your crotch is enough to make you forget your breath. You flex your cock and feel the pleasure wash over you. You think about pulling it out and stroking it right there. After all, if they can fuck in the bathroom and not worry, why should you worry about jerking off here. You think about how nice it must be to fuck at school. You cock throbs again. You think about what it would feel like to fuck Mark's ass. Your cock throbs and you feel your orgasm rising. You concentrate and calm yourself down.