Step-sis Humps Your Desk

I come into your room, having been sent in by our step-mom, to help with some of your work. I lean over your desk to try and see what you’re doing, my pussy grazing against the corner of your desk, and that sets it all off. I cant help but start humping against the corner of your desk, acting like I’m doing nothing, getting distracted trying to help you. I even go as far as hitching my dress up slightly to grind even harder. There’s a wet pussy juice patch on the corner of your desk, it’s creaking louder, and then your step-sister it having an orgasm right next to you, her pussy against the corner, acting like nothing is wrong with that. I eventually leave the room, and even have the cheek to ask where you got your desk from.