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Your step sis best friend is over to do a joint project, but she ends up taking over and so her bestie gets bored and whilst going to the hall wanders astray... She comes into your room, unaware that up until this point you have been jerking your cock watching porn. She lifts up the towel and sees your bulging cock and just cant resist... she needs it in her mouth. Taboo "almost caught" dirty talk throughout.