Eventfully

It's English next, you have to deliver a presentation on the use of language in advertising but you are feeling pretty good about it. Maybe these panties are lucky?

As you're walking down the hallway you notice a group of cheerleaders whispering to each other under their breath, they stop look at you as you walk past, making eye contact with each other. Word is getting round about you, good word.

Sophie is in-front of you, her red thong teasingly poking out over the top of her yoga pants. The hallway becomes a crush and before you know it you're right up against the back of her, and you're very turned on. Your sock stuffed crotch is now rubbing up against her ass and you could swear she is backing into you purposefully. It all becomes too much and you lose control and begin to grind against her ass, you make eye contact with your sister across the hall just as you climax, she is displaying a look which is somewhere between confusion and disgust. You've let out a slightly moan and Sophie looks round confused, bright red, you attempt play it off and claim someone trod on your toe as you finally escape to the bathroom to clean up the mess you've made.