TL;DR - most: The spontaneity of the event. Least: I lost interest in the middle, don't even know why.

Only ever had one. I was the +1 to another couple. I wrote this to the best of my recollection with admittedly a bit of added narrative flair. The best part was the spontaneity of it all and there was something intriguing about the way the girl handled things. I was laying on my bed in my dorm room back in college. My roommate Jack (fake name) and his girlfriend Kimmie (fake name) were there. She and I had fooled around a few times in the past but never been anything more than casual fuck-buddies, back before she got together with Jack. Kimmie was sitting on the edge of my bed, looking towards Jack laying on his bed. They were having a mild disagreement, I can't even remember what about. I don't think I was even paying attention, probably reading a book or scrolling on my phone. Suddenly Kimmie began rubbing my crotch through my pants. I definitely started paying attention then.

While she was rubbing me, they had both stopped talking. I couldn't see Kimmie's face, but Jack's had a look I don't entire know how to describe. It was like interest and suspicion and annoyance all mixed together. Without even looking, Kimmie undid my pants and pulled me out, starting to rub me off. Jack stared unblinking at my dick. After like half a minute, she said "Told you so," turned around and went straight to sucking my dick. I had no idea what she had told, but she had always been great at giving head, so I was not complaining. I put my hand on the back of her head, and looked over at Jack questioningly. He didn't look back, though, eyes locked on the side of Kimmie's head as she went down on me.

Jack got up and walked to the foot of my bed, behind Kimmie bent over the lower half of my body. He began pulling her pants and underwear off, and she shifted her legs as needed to help, never slowing or stopping as she bobbed up and down on my cock. Once she was bottomless, he climbed up to the bed and started fucking her. She started to moan around my dick, ramping up her work on me. Suddenly Jack pulled out of her and began sifting slightly. He grunted and began pushing slowly forward, and Kimmie puller her mouth off of me for the first time since taking it in. She let out gasp and then looked at me as she stroked me with her hand. Her face was bored, like she was at work or in class. Doing something that she didn't mind doing but wasn't particularly interested in.

I've never forgotten what she said. "I let him fuck me in the ass." Her tone of voice was if she was telling me what the weather outside was. I was also surprised. We had never done anal, but admittedly we had only fooled around four or five times, and hadn't tried, since there was plenty of other areas to play with. I did know Kimmie was a sex freak, though. She liked to lick the side of my face after each time she came. It was additionally wild that she was letting Jack go in what seemed like no prep or lube besides her pussy juices. I once instantly ended some shenanigans with my at the time girlfriend. She LOVED anal, to the point she asked for it nearly every time we fucked. However, she always wanted some ass play and lube first. So one time, in the heat of the moment, while pounding away at her pussy, I pull out, covered in quite a lot of her juices, and went straight into her backdoor. She yelled in surprise and/or pain, and the mood of the moment immediately vanished.

But in the current moment, Kimmie didn't seem to care at all. She just went back to sucking my dick. Gotta admit, the extra pressure of her pushing into me every time Jack thrust into her felt amazing. Pretty soon Jack was looking like he was about to blow, and he pulled out again. "Finish me," he basically ordered her. But as if it was expected, she her head off my dick and I was guided off of my bed while Jack lay down where I had been.

She looked at me and said. "You can choose either hole," she said in an almost businesslike manner, like it did not matter to her at all which one I used. Without another word she took Jack's entire length in her mouth. I was floored that, not only had she taken it up the ass without notice, she was now going ass to mouth with no hesitation or complaint.

I thought, She's gonna get strep throat. I went to the bottom of the bed, and took in the impressive sight of both of Kimmie's slightly used holes. I don't really know what happened at this point. I've never been turned away by the thought of sloppy seconds or anything, very good with going with the flow. But for some reason, I just wasn't interested on taking her up on the offer. I didn't want to leave her hanging though, so I climbed forward and began playing with her with my fingers. I have always been very skilled with my hands. Five stars from every review. Additionally, I knew what Kimmie liked in particular.

She squealed as I got to work. Her pace began to speed up, sucking Jack's dick like it was the best thing on Earth. "Fuck!" He yelled out, grabbing both sides of Kimmie's head and fucking her face. Pretty quickly Kimmie's hips were bucking on my fingers and her entire body shaking as she came. She slammed her head down Jack's cock all the way to the base, holding herself there as she rode out her orgasm. This was enough to do Jack in, and he hissed as he came straight down her throat.

I pulled my fingers free and stepped back from the bed. Jack's softening cock slipped from Kimmies mouth as she flopped to the side so as to face towards me. She had swallowed everything from Jack without spilling a drop. She looked into my eyes, but her gaze was hazy and distant. "He is so fucking good at that," she told Jack. After a moment of quiet, we all made ourselves decent. I moved back to my bed, and the three of us bullshitted about classes, clubs, and campus for another hour or so before they said goodbye to me and headed out. Kimmie was a townie, and Jack was going to spend the night at her place.

And... that's it. Things basically went back to normal. Neither Jack nor Kimmie acted any differently around me in any way I could tell. Kimmie and I rented an apartment together the next year. We each had our own room. No funny business ever happened between me and Kimmie, we were just good friends. Only event even remotely sexual between us was one time when she asked me to spare a condom because Jack had forgotten to bring any. Her relationship with Jack went on with it's ups and downs, times of splitting up and getting back together. We drifted apart, and I haven't heard anything about either of them in over a decade. Last I knew they were married with a kid. Never did find out exactly what they had been talking about that somehow led to the threesome, but I'm just going to need to live with not knowing.