Dirty talk leads to reality [cuckold]

My girlfriend and I always loved dirty talk in the bedroom, specifically me hearing about her past, her telling me she has had better and of course wanting to fuck other guys.
She would get going and tell me to tell her how I want to see her take another cock, to get fucked by a bigger better guy and she would tease me and make me beg to find her another guy.

Fast forward to about a year and a half into being with her and we went to visit a friend of mine. After a long night of drinking and catching up we're headed to bed.
And as usual we started getting into the dirty talk. There I was begging for her to fuck other men,
You want to watch me suck another guys cock she would say, you want to watch him fuck me with his big cock…… yes I want to see him deep inside you, want him to fuck you better than I can. I want to see him cum inside you…. she responded with and than you can clean me up like a good boy, and lick his cum from me….. I was going wild with her words and just blurted out fuck yes

Just than we heard some static…. than a voice, my friends voice, " I'd be happy to help with that"

See the room we were staying In had his child's crib in it ( child was at his mother's at the time )
And along with that was the monitor….

He was listening to it all, everything that was being said.
My GF looked at me with a smile, than said
" come to our room"

Within moments our door opened up and my friend came bouncing in chuckling and straight up to the bed. We laid there in silence for what seemed like forever ( probably 30 sec) when she sat up, letting the blanket fall exposing her breast.
I remember it clear as day, my friend mumbled out " oh shit are you serious"
She leaned over to me, kissed me than whispered
Take his down, i want to see his cock