After swearing me to secrecy (if friends/family asked, she didn't want them to know she was visiting them alone), itinerary set, bags packed, etc., she was ready to go. Sex was fun before she left; I was asking her if she was going to show him her big titties and ass, if they both were going to get her pussy, was she going to play with the wife, and the like, and we were enjoying fantasizing about it.
I was chatting online with the husband in the weeks and days leading up to her arrival, and we had similar discussions, and after assuring him she had my approval to do whatever she wanted, I was even giving him tips on how to seduce my wife, and what she enjoyed sexually.
In spite of the build-up and initial excitement, nothing much happened this particular time. That couple was fond of drinking, mostly to excess, and enjoying the benefits of their hot tub. Her first night there, they all got in, but my wife didn't want to be naked in front of them, in spite of the fact they were in front of her! The husband messaged me the next night, and we chatted for a bit. He asked me how I would like for his wife and mine to suck my dick at the same time, I replied it would be both hot and enjoyable, and asked if that's what they had done for him. He answered yes, they had just finished taking turns sucking him off; first his wife, then mine, and they traded off back and forth!
They did get into the hot tub again afterward, but my wife would still not go full nude. I did convince her to just wear a t-shirt so he could still see her titties, even though she was "covered". But other than the typical light touching and kissing, flirting, and so forth, they didn't do anything.
That's the most they did this time. The wives would lightly touch and kiss when drying off after soaking in the tub (in private), there was a bit of flashing, lots of suggestive talk and flirting, but no physical sex. Their work schedule dominated the weekdays, so the partying was limited to the weekends, and they had already enjoyed that.