I would love to be able to replay my threesome and foursome from college! I still jerk off with the memories of those nights.
Quick recap:
3sum: a girlfriend of mine and a co-worker of hers. Did all of the usual, both sucking her tits together, each of us fucking her while she blew the other one, and for the finale she asked me to help blow her co-worker, which I did. He came in my mouth and then I shared it in a kiss with my girlfriend. Total sex time was about 2 hours with several orgasms for my girfriend and 3 for me and her co-worker.
4sum: same girlfriend and another couple we knew. Started with respective partners, then swapped and then a free for all. Girls did bi, but the other guy wasn't into that so we just watched while we recuperated.
That girlfriend was a firecracker! We had great sex while it lasted, but she wasn't interested in anything long term. Still fantasize about her all the time though!