Would OP mind if it's set in multiple time periods, mostly focusing on how the relationship evolves? And smut, is smut good? And creepy sex (because I totally love creepy sex in which they discuss what they will do and stuff...)?

I would not write it as much of a Bonny and Clyde thing, but more... disturbing. Yes, I think disturbing is fitting. So, uhm, maybe the love will show a bit less. Is that acceptable?