Intimate encounter with my emotionally wounded stepsister at home

A couple of years ago, my stepsister went through a tough time emotionally and she decided to move out. She's been living in her own place for a couple of years now. Recently, she came back to our house and as it turned out, she was quite happy to see my girlfriend. My girlfriend is a big fan of hardcore sex and as it turned out, my stepsister is not that different. So, after a couple of drinks, we all got naked and started fucking. At first, my stepsister was shy, but after a few minutes of fucking, she got completely wild. She was screaming with pleasure, enjoying every second of it. The action continued with the brunette riding my dick and then I fucked her doggy style. The whole thing was very hot and intense and we all really enjoyed it.