Hidden Femme Fatale [Adult Trio x OC]

Warning: Mature because of a really small future amount of gore, swearing words, and sexual content!

2nd warning: She will end with only one person. Also it's not necessarily everyone from adult trio to have romantic feelings towards our heroine.
-----------------------------------------------------------------
Kusanagi [Y/n] was just a cheerful woman looking for friends. Or that's what she thought. Totally forgetting about her dark past and that one murderer that it's now after her.
She was wearing an invisible mask, keeping away the hidden monster. But for how long? What will happen if two specific individuals break that mask and show a true femme fatale just for their needs? Or perhaps for every criminal's worst case?
-----------------------------------------------------------------
It's an OC fanfiction but I'm kind of bad with names so I left it as a first name of your choice. It may turn out as an "x reader". : D
-----------------------------------------------------------------
The picture is not mine. Edited only the eyes.