Three Years Of Great Discreet Sex

Ehhh!

You wrote extensively about sex and did a fair job at that. Which is good, but I though you completely missed the personnel element. As a result, it was dry. we did that then we did this, and then there was the time we... It wasn't bad, without the emotional element it was flat. Try to bring their feelings in, including how the felt about the affair and their spouses.
Secondly there needs to be some dramatic moments. Did they come close to getting caught? Live ins get suspicious?


I didn't vote for it as I think you are a better writer than this example.
Chilley

If they weren't married and the sex was that good then they should have just quit cheating on their partners and legitimately gotten together.

Good!

Now, you've done your "homework" properly (grammar & stuff).
I've really liked your story, even if, from my point of view, it was a little bit too long and repetitive - but having good quality sex is... just like this!
I've rated you with 4 stars.
Good luck!