Long story: Several years ago I had a boyfriend Mike, we split up because I could not handle his bisexuality.
Up until last year I was dating/living with a girl called Lucy. She was very active in the swinger scene and pulled me into it. Often we had a third girl for the weekend. I had stayed in touch with Mike, largely for his DIY skills. No, that is not a euphemism, lol. He would come over to fix something or other and Lucy would fuck him in payment.
Anyway, one weekend she had to visit her parents and told me she had invited Mike over to keep me company (and do some odd jobs). She told me that fucking him was optional and winked. I resigned myself to a weekend of straight sex.
What I did not know at the time, was that she had arranged for a couple that Mike knew (both late teens, younger than us) to join us for the weekend. This straight couple had expressed an interest in swinging to Lucy, but had never done anything. It was to be a voyeuristic meeting, us watching them and they watching us, but no mixing.
I found out about the arrangement late on Friday evening, from Mike, 10 minutes before they arrived. They were both stunning looking and I could tell that Mike was hard the moment they walked in. It was about 10pm when they arrived and midnight when enough wine had been consumed to relax everyone. They were still unsure about what was going to happen, and there were some long awkward pauses in the conversation. I impulsively grabbed Mike's jeans, unzipped him, he never wore underwear, and brought out his hardon and started stroking it. I asked Anna what she thought of it and she blushed as she said lovely or somesuch.
I slipped off the settee and knelt in front of Mike, he removed his Jeans fully and I took his erection in my mouth. After sucking him for a while, I looked over to the other settee to see them both gazing intently at us, Jason's trousers tented and Anna shifting about, obviously wet herself. I was wearing a fairly short skirt and from where they were sitting, could probably see my panties were wet.