Young curvy step sister seeks pregnancy avoidance through sex

My curvy step sister is always scheming, and this time it's about avoiding a possible pregnancy. She's got a nice body, with a big ass and blue eyes that can mesmerize anyone. I've caught her on multiple occasions, bent over, ready to get fucked. It's a fetish thing, and she's always down for it. She's a naughty 18-year-old with a tight pussy and a love for sucking dick. We've had some wild sessions, with me fucking her hard in doggystyle and cowgirl positions. The creampie is always a bonus, and she's never shy about taking it. Our encounters are always intense, with her ample curves bouncing as I pound her. It's a taboo situation, but we both enjoy it. She's always up for a good time, and I can't resist her seductive charm.