Made a post here a while back and the advice was very helpful.

I was a virgin when I met my wife and she had some, but not very much, sexual experience before me. Our relationship has involved a lot of exploration and experimentation.

My best friend from childhood is poly and consequently is much more experienced than either of us. Before marriage, my wife and my friend started conversing on Facebook. It started normally but slowly over time became more sexually charged.

They both checked in with me every time they escalated to racier things and it veered more into what would be considered inappropriate in a monogamous relationship.

This week their chats reached new levels. They started a game of truth or dare which resulted in her sending him nudes and some low key sexting (which I asked them to pump the brakes on as I'm not ready to go there yet but was pretty hot).

Last night his dare was for us to try something in bed we both had as a soft boundary and I don't know if it was the act itself or his tangential participation in our bedroom but it was some of the best sex we've ever had.

I'm starting to think I have a hotwife kink of some kind. We're miles away from considering sex with others but as someone who waited until 33 to lose their virginity to make sure it was to "the one" I knew I would marry, my opinions, boundaries, and expectations in this monogamous relationship have shifted drastically and towards something very enjoyable that I thought I'd never be ok with.

Most stories I read on reddit involve one partner broaching the concept of ENM to the other and encountering reluctance. Is it common for things to just evolve naturally?