My parents remarried and my step-sister was so in love with me that I was stalking her in the house, rummaging through her underwear, and even knowing her masturbation frequency and menstrual cycle! If my parents found out, I'd be kicked out of the house and wouldn't be able to see my step-sister! Just thinking about it made my desires run wild! I licked my step-sister's tits and pussy, and even forced her to give me a blowjob and cum inside her... I kept cumming inside my step-sister on her dangerous days, and her resistance gradually weakened and she started to feel it, so I got happy and cummed inside her 13 times in a row!