If you mark your sim to not age (which can be easily achieved with a mod such as MCC, then their life won't be drained, for now. But long term, I agree with you. The succubi in their current form and until powers are added, will be what I consider to be 'base succubi' the lowest level of a full succubus. In the future I will definitely be adding ways that you can protect the life force of certain partners!!!   Getting a true occult form system was just such a technical challenging and