His Wife Is A Slut

Over the last eighteen months I've been fucking my bosses wife. She's not the prettiest woman out there, but she's got an amazing body, and she's a real dirty slut. Well she is with me anyway.
He's in his mid fifties, she's thirty four and was his trophy wife.
We fuck at work sometimes, when she calls in to pick him up. But mostly we have sex at my flat, or occasionally in her car.
We have had sex in their bed too, when he visits the Czech Republic on business. Or that's why he says he goes.
However I've just found out he goes over there to have gay sex. From what his wife says, he's got a tiny cock, so I think he pays for guys to fuck him.
I'm not complaining as she's one hellnof a fuck and will try just about anything.
The mad thing is, even though he's obviously cheating on her, he's extremely possessive of her.
If he knew I was screwing her mouth, pussy and arsehole three or four times a week, I'd be sacked.