Adorable stepsister needs strict guidance in sex acts

I’ve been trying my best to be a good sister to my stepsis, but it’s getting harder and harder to resist her. She’s always asking me for help with her boyfriend, saying he’s too rough and doesn’t know how to please her. I can’t deny that she’s pretty hot, with her tight ass and cute face, but I’m not sure if I want to get involved in this taboo shit. So, when she comes over again, I just tell her to wait for her boyfriend, but she’s not having it. She’s horny as hell and needs some strict guidance in sex acts. I can’t say no to that, can I? So, I let her give me a blowjob and then we start fucking hardcore. This young brunette is definitely worth the trouble, and I can’t wait to do it again.