My Step Sister wants to fuck and Creampie her fat pussy, in our Parents' bed

My parents are out and my stepsister takes the opportunity to cheer me up and takes me to our parents' room. She starts to shake PAWG's big ass. She excites me so much that she gives him like her tits and her pussy. I then started fucking her in a missionary position and took a closer look at her thick pussy. I get so horny that I put her in a doggy position and start fucking her so hard that I end up spilling all the cum in her pussy, I hope I don't get her pregnant. Because I don't know how to explain this to my parents... This chubby girl drives me crazy