My stepsister with big ass helped me reach orgasm and had sex with me - she got pregnant from my sperm

I was in my room, flipping through some comics, when my stepsister came in and sat down next to me. She noticed I was struggling to reach my orgasm, so she offered to help. At first, she just gave me a blowjob, but then we ended up having sex. It was a wild ride, with her riding me and me fucking her in various positions. The climax was intense, and I came all over her. As it turns out, she got pregnant from my sperm.