Birthday Present

Returned home from work two months ago to a very surprise birthday present.
My wife knew before we met six years ago, I regularly fucked younger guys. Since we got together I'd not indulged sexually with a guy. But that changed two months back.
Lay on our lounge room rug, was a young effeminate gay naked guy and he was slowly inserting a small dildo up his arsehole.
My wife was sat with her legs apart playing with her clit, and as I stood shocked looking at them both from the doorway, my wife said "Happy birthday honey".
The young guy is someone she knows from her workplace. Someone I now know likes older guys with a big cock.
We went back and forth with 'For me' 'Are you sure' 'Is this for real' etc. And each time my wife said yes, until she added "I want to watch you fuck him".
So after a quick shower, I walked back downstairs naked and very much fully erect, and had over an hours gay sex in front of my wife, fucking her young gay friend in countless positions, cumming twice.
Once all over his face, neck and hair. The second time, after he'd sucked my cock back to life, deep inside his cute tight arsehole.
And during the whole thing my wife watched, masturbated and orgasmed multiple times.
It's easily the best present I've ever received, and to top it all as I sucked on the young man's cock, making him cum so hard in my mouth, my wife gently at first, dildo fucked my arsehole. The first time I'd ever experienced anal stimulation like that.
The whole situation has rekindled a wonderful part of my life, and since then I've fucked our young friend over a dozen more times.
Some with my wife present, but increasingly on our own now he's changed job roles.
She knows perfectly well I'm fucking him apart from her, but my wife seems to love me telling her what we got up to sexually, before we go to bed and fuck.