Long story about our first time.
A friend was visiting, we're drinking in out hot tub, wife got topless, no biggie really, we'd done it before. Eventually we're all naked, again no big deal. Got late, we walk into the kitchen still naked, our cloths were in livingroom. I don't really know how or why, but they hugged, kissed for like 5 seconds then he fucked her over the back of the couch. Took maybe 3 minutes start to finish, awkward as hell, he left. Wife starts crying, apologized over and over. My mind was a mess. We ended up having 3 rounds of sex that night.
Just worked up to where we are now, he visits 2 - 3 times a month, we're all comfy together, we take turns doing her, we all enjoy.
I will say I'm good with everything but sometimes it's like she's just a little too into enjoying sex with him. I'm always present, I get plenty of sex too, she is horny as hell for days after, she fucks me every morning and night for a good week.
I do get jealous thoughts often but it's all good after he's gone.