@-Galick_Gun-
You're welcome. <3
My idea would be partially based off a Japanese horror film called "Audition". It's actually pretty famous, so I wouldn't be surprised if you possibly saw it before.
My idea though, is that a man, after either his wife died, or a really horrible divorce, decides to start dating again when he feels his son can actually handle seeing him with someone new.
The woman he falls for(Kiku), he meets through a fake audition, and while she fulfills his needs, she's also quite mysterious, not disclosing much about her past.
I don't have a super intricate plot in mind, but, the son(Whether it's Slade, or Charlie), wouldn't trust Kiku at first, sensing that's something is wrong/off with her, causing them to act quite hostile towards her.
This could either be due to Kiku being a Yandere, them not wanting their father to move on, or possibly the father gaslighting the girl because he's actually the creepy one, or a mix of these options.
Father and son wise, you could play whoever you want. <3