On Succubi: New succubi will drain the actual life force from their partners during sex. This has two effects. To refill the succubi orb motive known as depravity which is like a pool of magic that succubi can draw from and two, which I've been working on, to make the succubi younger but at the cost of aging their sex partner a bit. This means aging them all the way to the grave if need be.... and I have the first succubi caused death from testing just this situation in my dev build of the game!
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The balancing for this isn't done yet but it won't be drastic in normal gameplay, usually just stealing a few days at most per sex act from a partner sim. Also, as your succubus grows, they will gain more abilities for managing how much life they steal from partner, even if they steal at all.