My cuckold fantasy

A friend who we've not seen for a few years comes to stay. We go out on the town and my wife is looking stunning. She's wearing a very tight strappy top and short skirt. We are standing near the bar and soon I notice our friend flirting with my wife - standing close to her, brushing his arms and legs against hers. She obviously likes the attention and doesn't pull away. After a few drinks the two of them are getting on really well, laughing and touching each other. My wife is admiring our friends muscles and comments that I could do with working out like he obviously does. They start making fun of me, and after more drinks my wife begins to tell him about the chastity cage and strapon she likes to make me wear. It's so embarrassing but also a huge turn on to be humiliated like this. They're laughing so much my wife has to lean up against him to support herself, and as their faces come closer together his lips brush against her cheek and then she's doing the same. Soon their lips meet and for the first time I witness my wife kissing another man.
He's standing behind her now, and she's facing me but turns her head to him and I watch again as their tongues meet and they start kissing more passionately. I can see her gently grinding against him and I know she can feel his hard cock against her. His hands are on her hips but slowly move up to the sides of her breasts. I cant believe I'm watching my wife make out with another man in public.
My wife says "he's always wanted to watch me get fucked by another man". Our friend kisses my wife's neck, moves his hands up to cup her breasts and says "He can watch, but only if he wears his chastity cage". My wife groans and continues to grind against his cock.
"Let's do it", she says. "I want him to see what a real cock looks like".
We leave the bar, my wife and friend walking in front of me with their arms around each other's waists, their hands caressing each other.
When we get home we go to the kitchen and I pour drinks for them as they begin to kiss passionately, their hands running up and down each other's bodies.
My wife looks at me and says "This is what you've always wanted isn't it? To see me with a real man. Now go and put your cage on before you get too excited".
I go to the bedroom, strip naked and take out my chastity cage. My cock is already hard from watching my wife kiss our friend, but eventually I get the cage in place and close the little padlock. I walk out of the bedroom, my cock swelling in the cage. I find them in the lounge, sitting on the sofa. They are kissing again, their hands moving over each other's bodies. They laugh when they see me.
...
”Kneel before us, you pathetic little cuckold” my wife says, and I do as instructed. My wife’s hand is moving over the bulge in her lover’s trousers, and his hands are squeezing her big breasts. She begins pulling at the buttons on his trousers and suddenly his huge cock springs out. It is much bigger than mine, and she can barely get her fingers around it. He pulls her top off, and I’m watching my wife, in her bra, stroking another man’s cock. “I bet you wish this was your cock, don’t you?” She says, as she leans down and takes the throbbing head between her full, red lips. She looks so beautiful with her long, blonde hair. I can’t resist leaning forward and kissing her cheek. She takes him out of her mouth and kisses me, making me taste her lover’s cock and precum in her mouth.
Her lover undoes her bra and my wife’s big breasts are revealed to another man. She rubs his cock against them, covering her nipples in his precum. She rubs her tits all over my face, and then guides her nipples to my mouth. “When we’ve finished”, she says “you’re going to clean his cum off my breasts”.
My friend and my wife are laughing at me as I kneel there, my cock swelling in it’s cage, precum all over my face.