Stepsis catches you jerking to her pictures and then

Your stepsister follows you into your bedroom after you make a quick exit from the living room only to find you beating off to some photos. She thought something was wrong...and she was right! You're not just using photos of random girls but of HER! She just gets you so hot and bothered with her walking around the house in almost nothing and you just can't contain your urges. You're so embarrassed, practically the color of beet at her confrontation but that fades soon enough once she practically throws herself at you. Seems she's been curious about you as well. Are you ready to go all the way with her? Just remember...some doors can't be closed once you open them...