Surprised my wife

My wife and I are both 36 years old and have 2 children. We deal with a lot with our children when it comes to behaviors and activities. No sex in our lives. Especially since I have gotten a really bad sickness few years ago and has pretty much killed our sex life. I will finger her while she sucks on my limp dick till she gets off. My wife is on the thicker side, over a week ago I was talking to her as she got dressed and she just looked so sexy in her black g string and black lace bra I thought to myself she needs a good fucking.
So I thought for awhile who can have sex with my wife. I settled on a friend we hang out with from time to time. Our 43 year old black friend Sean.
Days ago I had invited Sean over just to hangout , eat dinner with us and have some drinks.
As night continued my wife and I had put the kids to bed. Went back to kitchen and chatted awhile with Sean.
I then expressed my desire to have my wife sexually pleased. We talked on it for awhile till my wife and Sean agreed. My wife did express she misses sex and Sean expressed it has been some time since he has blown his load.
They made there way back to bedroom and began to have sex. The door did stay cracked open incase I wanted to peak. Which I did toward the end. 35 mins passed that they were in there together.
I peaked in the door. Sean had my wife in doggy style with his hands gripped tight on her thick hips as he was clapping those cheeks loud. As he is grunting away and my wife moaning loud. I hear Sean say "oh damn, fuck, shit girl I'm going to cum" my wife immediately shouts "oh yes cum" Sean asked my wife "you want me to cum in that pussy?" My wife quickly replied "oh my God, oh my God, Yes, yes cum in my pussy"
With few more thrusts Sean yelled "Fuck" screamed really loud as I watched him unleash his built up load of cum right into my wifes pussy.
They lay together kissing before Sean left house for the night. My wife fell asleep after.

Next morning after the breakfast and kids went to play I talked to my wife.
Me: How did you enjoy last night?
Wife: OMG babe that was amazing
Me: I did watch through the door at that special moment
Wife: you liked it?
Me: yes
Wife: it felt so great
Me: I'm glad you liked it
Wife: Sean wasn't kidding
Me: with what?
Wife: That load build up
Me: oh yeah
Wife: omg yes it was quite a load. He shot so much cum inside my pussy.

It was quite the night. One she will never forget