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I come into my step-son's room and discover he's not there, but spot something on his bed, MY panties, covered in slimey gooey stuff. What the fuck is that?! I quickly come to realise it must be his cum.. what about my other missing panties, he must have them too, I soon find them behind his cushions. I sit on the bed talking to myself trying to figure this all out. My own step-son, cumming with his step-mom's panties?! Sniffing, tasting my holes as he strokes his cock?! Fantasising about me?! To my complete surprise this is turning me on, but then I hear him get home. I quickly sneak off to my bedroom, with the cummy panties, to satisfy myself. Talking to myself as I sniff his cum, taste it, and then an even naughtier idea comes into my head. I grab my dildo, scoop up some of the cum, and slide it into my pussy. Using his cum as lube, fucking myself thinking about him turned on by me, cumming with my own step-sons cum inside of me.