Alright, well the general synopsis is to change things up. FYI: here was my thought process
1) I want a lot of nymphs, that'll give you the "forbidden love" dynamic
2) The only good nymphs for damage are life, aether, air, and maybe time. Some, like earth, darkness, and entropy, work well as a combo.
3) I found out hitters in a deck, even if they're strong, are simply not enough. I decided to try using nymph queens off my mark and going mono.
4) Looking at all the monos, aether made the most sense. Tempting you with your beauty, distracting you as they slowly kill your helpless blue-balled ass. Resistant to control, resistant to damage, and TUs can beat voodoll. Clearly a strong deck, worthy of being a false god, but you'd still get a decent win rate with any form of permanent control.
So I made the deck.
My number two option (which I get the feeling you'd like more) would be an entropy+darkness duo. Entropy gives the "love" feel of it (I dunno, it's pink?) and vampire gives the dark/demon kind. It slowly drains life from you while you can do nothing but heal her mighty beauty.
However.
This deck would be a pushover. It'd lose to the top-3 FG decks, and wind up being a relic farm, and I stand by the fact that False Gods are the final boss of the game.
So thematically and deck-wise, there's a disconnect. A succubus, in all honesty, would be a fire-darkness. But fire and darkness, while having that evil-demonic-too-hot-too-handle theme, make a terrible forbidden love deck. They don't play off of the players "love" for them at all.
The strongest deck, aether, has /nothing/ to do with succubi unless I explain it. It's boring to play against, sure, but hey, it works.
The compromise, darkness/entropy, I'll build. But I still think it's too weak.