I (f30) am bisexual. Sometimes in bed my bf and I (46m) get off talking about what we’d do in a threesome.

One night we were deep in missionary, I was moaning telling him to go harder. He felt like he was going soft so I started talking about me fucking another girl. He picked up his speed while I described how I’d eat her pussy while he jacked off, how I’d ride her face beside him. Then I started talking about how I’d want him to fuck her. He started moaning under his breath and I felt him grow inside me. I picked a random name, Sabrina, and said I’d love to watch him bend Sabrina over. He started going waaaay harder and said “fuck she has such a nice ass”. It didn’t click at first but he grabbed my throat and sped up. I said “mmm yes daddy imagine how tight she is”. He pumped harder and said “I do, all the time” and then it hit me. He was talking about his 18 year old psych student, Sabrina. A bubbly little brunette with a large ass who models to pay for school. I was infuriated but also getting wetter. He started talking shit about how he’s sure Sabrina’s a slut, how she hardly ever wears a bra, how she shows up to class late and sloppy like she took pathetic frat boy cock all night. He said she needed a real man in her sloppy cunt. I was screaming now and he was sucking my nipples. I reached down and rubbed my clit. He thrust harder and faster,, slamming me harder than ever while the bed violently shook and I was being slammed into the headboard, then he moaned “ohhhhh sabrinaaaa good fucking girl” and came in me unprotected. He rolled over and fell asleep. I was kinda pissed off but I found my hand wandering down to my pussy, picturing this 46 year old man fucking this teenager, or wondering if he stares at her in class, if he has to conceal his hard dick around her or other sexy female student, and I came and fell asleep.