Lucky Me

Woke up early this morning at five thirty, with a warm wet feeling surrounding my morning glory.
It wasn't my wife, she didn't finish her night shift at the care home until eight.
It was her son Zack sucking on my hard on and licking my balls.
He wanted fucking again, something we'd done all night. The seventeen year old is one dirty little gay slut and I love it.
We fuck a lot, and this morning was no exception. Once I'd fully woken up, I spun him around and plunged my cock right into his already cum coated hole.
If there's two bisexual-gay guys who are sexually compatible, it's me and Zack.
His libido is similar to mine and that's extremely high. His mother who I married eight years ago, has all but lost her sex drive and I'm lucky if we have sex once a month.
So once Zack, who's openly gay and I began having sex, oral at first, we haven't stopped fucking.
I took his cherry nine months ago and since then we've fucked pretty much every single day.
What's probably different to other family members having gay sex like us, is the fact his mother knows perfectly well we're having sex.
Indeed it was Zacks mum who asked her son to speak to me about safe sex and exploring his sexuality.
It was during one of those talks I got an erection, Zack saw it and things flowed from there.
One afternoon with zack and I having oral sex in the kitchen, his mum walked in on us. She asked us if we were hungry and I swear, as Zack sucked on my dick, she made us both a sandwich.
And it's been like that ever since. She has once more caught us fucking in our bed, but Zack and I try not to enjoy ourselves openly in front of his mum.
All she says to me, is don't hurt my son. She means emotionally and I never will.
Once he decides he wants or has someone his age to enjoy himself with, I'll happily carry on just fucking one of the office juniors.
He's nineteen, very effeminate and likes to dress up. We fuck a few times a week at work, and he's been hinting he'd love to spend a night together.
I'm thinking of inviting him round to our house, but first I'll have to see if Zack's up for the threesome.
I hope so.