Spent the day pretending to be the good girl everyone sees. Smiled sweetly, helped around the house, played the innocent little sister role perfectly. But the whole time, my cunt was throbbing, soaked through my panties just from the casual brush of his shoulder against mine in the hallway. I had to lock myself in the bathroom twice, fucking my own fingers roughly, biting my lip to stay quiet, imagining it was his cock pounding into me instead. The contrast is what drives me wild—being the angel in the light while my mind is pure, filthy devil. I live for the day the mask slips for good and he sees the desperate, begging slut I really am for him.