Looking for this story... for a while now.

The story's simple enough, I wonder why I can't find it.

It's a blackmail story. A teenager finds out his aunt poisoned her husband. He starts forcing his two cousins for sex and some bondage. But his main target was his sexy aunt. I remember a scene where he was sitting on a couch with his aunt and he told her to keep her hands behind her head while he slowly strips her and plays around with her body. After that they showered together with the woman's hands tied to her sides. In the following chapter the guy shares his aunt to a friend.

I think it's pretty old, maybe some of you guys have come across this story?

Thanks!