Thinking about wife fucking a co-worker

One night my wife said she wanted to have a talk with me about something. I was a little confused and nervous what this would be about.

When we sat down she mentioned that there was a male coworker of hers that has been pretty flirty with her recently. She thought nothing of it at first but over time the comments and actions got more bold / direct. She then admitted that the interactions have been on her mind and she has recently had desires of wanting to actually act on these comments and do things with her coworker.

I was pretty shocked as mostly thought of my wife as pretty vanilla. But ever since she had told me about that I can't stop thinking about watching her fuck her coworker and/or other guys.