So it's all but outright said at this point that Qetesh is MC's mother right. No need to argue this. So I would like to point out a couple of potential benefits to MC's demi-god status:
•The likleyhood is he will live longer than a regular human because hes a Demi-God. While probably not immortal he wont be outlived by his longer living LIs (Vamps, Demons & Deities not withstanding).
•He may be able to imbue the same eternal youth blessing to his LIs wither himself or through Qetesh so they stay as they are for as long as they are with him (he himself may have/gain this blessing too).
[Him being a Demi-God of Fertility also explains alot about him. How hes able to always get the girl hes after or how things always seem tow work out for him in the relationship/sex department even though he should definitely be dumped most times. It also explains his amazing stamina (even without the aid of Mass or Energy Potions, He can fuck at least 10-14 women in one day which is impresive). It also explains why their are never any birth complications or incestuous mutations/deformities no matter how many kids he has, their grandmother is a Fertility goddess so each pregnancy is blessed/protected by her.]