Embarrassed husband sees wife's friend naked...and they fuck

My wife's friend came to stay. As we head through to say goodnight, we walk in on her naked. I didn't know where to look and felt so embarrassed. I've always thought that she is cute but it was really awkward. She was great about it and not shy at all. My wife thought that the whole thing was hilarious. Between them, somehow, they turned the whole situation into a cuckquean/swingers thing and I ended up fucking her friend in front of her. It's a little less embarrassing now, but I can still picture her naked!