First time MMF Bi threesome with a couple:

Mine happened in the late 1970s with a boyfriend/girlfriend couple, and it turned out to be a total surprise for me. Anyway, I’d hadn’t had sex with a guy in years and the last time had been rather unpleasant, so I really wasn’t thinking about the guy. I had met this young blonde guy and his sexy girlfriend at a party and later was asked to join them in a threesome. I gladly agreed and arrived at their house the next Saturday evening. She wasn’t there but he was, so we smoked some pot and had a couple of drinks and chatted about things, mostly women. He did talk about having plenty of KY jelly and some rubbers, but I didn’t really catch on to what he was suggesting. I had shorts on and I did think he was looking at my ass frequently, but i still was a bit gullible about these things. I found out the goal when she got home and asked me to please let him fuck my cute little butt while she watched. I was like, what the hell?? However, I knew from years before I could likely accommodate him, and the idea of her watching was a whole new level of turn on. Also as a reward afterwards I could have my way with her while he watched. I looked over at him and he smiled and laughed, and I reluctantly agreed, only if he wasn’t too rough. Assured he wouldn’t hurt me I removed my shorts and shirt while he slid his jeans and underwear off. Luckily his cock wasn’t too big, about average but with a rather large bulbous head on it. She was already playing with my ass cheeks and I bent over the couch and got ready. Soon I felt her slender finger slide into my butt with a generous glob of KY jelly, then withdraw. He got into position as she slid a condom on his hard dick ( I heard it popping on) and squeezed some lube on him. I braced myself for it, honestly I was tight back there and scared he would hurt, especially the big bullet head going in. I tried to relax as she spread my cheeks and I felt his big cock head circle around my butthole. So far it felt good, and I spread my legs out some more as he began pushing against me. His big cock head was stretching me open as I pushed back on it and finally it slipped in past my sphincter muscle. It was quite a stretch and he held it there for a couple of minutes to let me adjust. I began to get used to the invasion and wiggled my butt on it as he eased the shaft in me, held it there for a few more minutes, eased back some, then began fucking me gradually faster. It felt good and it hurt at the same time, but I knew I liked it even knowing I’d be sore. He had a lot of stamina and he fucked me for a long time, pulled all the way out once (the head made a popping sound, got a fresh rubber and lube and went back in me. His girlfriend cheered the whole time and played with my cock and balls and herself, finally I could tell he was cumming and pulled out.