stories about unfaithful women that don't involve cuckolding?

[SecretGuardian]

Well, the truth is that I have always enjoyed erotic stories about unfaithful women. However, I feel that the internet is saturated with cuckold stories, which I like, but sometimes I want something different.

I'm interested in stories where a woman has an affair with a man other than her husband, and her husband doesn't find out about it.

While I am specifically looking for these characteristics, I could read anything that is good as long as it adheres to the premise of the post.

1. I like it when the infidelity is simmering, when there is seduction by the other man, and when the woman is reluctant at first but then falls for it and starts to enjoy it.
2. Bonus points if the man she cheats with is older, ugly or a bastard.
3. The longer the story, the better.

Anyway, thanks in advance.

P.S. I'm already familiar with the stories from The Shadow Rising, so I'd like to read some new ones.