Cindy and I had just moved to a new house.
At a neighborhood meet and greet, we met Ron and Kat. We quickly established that the four of us were swingers and they had invited us over that evening with a few of their other "friends".
Around nine, we walked over to their house.
Cindy had already fucked one of the neighbors earlier that day, his cock having been recommended by Kat, our hostess. Just like asking a neighbor for a recommendation on a good plumber or electrician, He was, per Kat, nice,, clean, discrete, no drama, and had a large cock. The owner of that large cock had repeatedly teased a flimsily covered nipple (or two) of Cindy's during an afternoon party and the nipple(s) had sent an urgent message to her pussy. Pussy had sent a message to Cindy's brain to go find that cock and have it cum over. (There's a blog with more details about that.)