Wife’s first threesome[MFM]

(I get some flack about making stories up, I don’t, I’m only changing names and some details, get over it)

Background-So my wife and I met in college and were together for eight years before getting married. We dabbled in almost everything sexual in our 23 year relationship.

I was under 18 when we met in college and I knew her as a somewhat slutty girlfriend of a guy in my social circle. I’d heard rumors of her having sex at a party, while someone watched, but I was “too young” to get invited to those parties.