A large number of the extended family is invited to the large Sunday dinners that my boyfriend's M28 family enjoys hosting. We frequently stay the night because we always manage to get wasted when we go. When they last saw one other, F20, his younger sister, brought her new boyfriend M20. I got along with him and he was chill. They also decided to spend the night. His folks always go to bed at the crack of 10 o'clock. The last people smoking pot in their garden were my boyfriend and I. I strolled by her bedroom, which was open, to get my vape. Her legs were raised in the air as she lay on the bed, and he was ploughing her hard. I could only see for a few seconds but it was so hot I was actually jealous. Made me so horny, I needed to fuck my BF instantly, when he railed me I thought about the moment with his little sister