30 [M4A] NY threesome with my wife and her (f) best friend

About 6 months ago, my wife and I had a threesome with her best friend. They’ve known each other since they were kids and her friend has a boyfriend who she’s been with for years. It was completely unplanned and unexpected. He has no idea.

My wife and I have been having threesomes (both mmf and mff) for years and we also really enjoy swinging and partner swapping. Her friend had no idea about this until my wife drunkenly told her about it a few weeks before this happened. I haven’t been able to tell a soul about this, but tonight I can’t stop thinking about it