I'm an 18 bi male that recently had a threesome with my 23 year old sister and her boyfriend. We were partying and I stayed at their place and my sister told me her bf wanted to fool around with a guy in front of her and she wanted it to be me. I thought it was super hot. He came into the room in boxers with a raging boner. My sister got on her knees and sucked him off right in front of me. She talked dirty while she did it. Telling him about all the cock she has sucked. I was super turned on. Plus he had a huge cock. She told me to join her so I did

Me and my sister sucked her boufriends hihe cock off together. We kissed a few times while we did it. He liked that. He wanted to see more of that. So he sat across from us and we went on the couch and made out out while he watched. Then her and him sucked my cock together and at one point she joked not to tell our parents and that made me cum so hard and so much. It filled her mouth and she swallowed it all.

Then I watched her and her bf fuck for the rest of the night