Wife Swap Night Goes Wildly Unexpected

My wife and I have been married twenty years now. We've tried everything to spice up our sex life over the years, blindfolds, spanking, role-play, you name it. But last night was something else entirely. I had a sudden craving for a bit of kink that we never really explored before, an arranged wife swap sort of thing. To my surprise, she said yes right away and texted one of her old friends, asking if they wanted to join us in some consensual foursome fun. The moment the guys arrived at our place, I could feel myself getting excited beyond anything we've ever done together before. We all started off with a bit of small talk and drinks, but soon enough, it was just four bodies moving together in ways that were both exhilarating and intimate. My wife and her friend explored each other's bodies openly while my partner guided me to places I never knew existed. By the end of the night, we had shared every kind of kiss and touch you could imagine. There wasn't an inch on our skin or limb not experienced in some way. It felt liberating, like a new chapter opening in our sex life. But here’s what worries me: is this something I should be doing regularly? Is there a line that we're stepping over? What do other married couples think about this kind of night?