Will She Let Us ?

My wife knew before we met, and knows now, that I sometimes fuck younger guys. Indeed she's actually watched me fuck a couple of guys earlier in our marriage.
I'm still fucking younger men she doesn't know about, and one especially she knows very well, but hasn't got a clue I'm fucking him.
He's my step son Alex, who's nineteen and as I've come to find out, adores my dick up his arsehole.
He caught me fucking a guy I'd met while out cruising. Bringing him back for sex knowing my wife was at work, and Alex at college, I was literally balls deep up the young guys arse when Alex walked in.
Thinking he might tell his mum, instead he had the young guy leave, then undressed telling me he wanted my spunk.
I genuinely didn't know he was bisexual, but that afternoon I fucked my step son twice. And just finished fucking Alex in the shower before his mum got home.
Since then we've fucked a lot, but he knows I like to fuck strangers too (always wearing protection).
I'm kind of hoping one day my wife will find out about Alex and I, and possibly accept we're fucking. Then we won't have to hide that I fuck her son three or four times a week.