I have mad "epic of a vampire dragon" vibes from this novel but I'm still loving it so far

I don't really get what you mean by leaching since the mc is literally indifferent about the people around him except for his two lovers. The first lover Lily can be considered a genius for her generation in the novel and has amazing potential due to her constitution that was explained by Luna. The second lover Valentina is a powerful divine beast who also has a lot of potential and is currently even stronger than the mc. But I will agree she relies on the mc to much despite her overwhelming strength and is naive at times.

I will admit that was a good "my vampire system" reference when he said he doesn't have a vampire system that requires him to drink 3 litres of water every day

actually I'm pretty sure it was the part of her soul that was cut apart by that god dudes attack which is why it specifies it and why the samsura system glitched and reincarnated that ”%37n soul" along with her because it was previously apart of her original soul

I don't know why but everytime they mention black flame I think of Itachi's amaterasu black flame jutsu

actually I think it was the same person who the systems A.I was based after, meaning the person he said who was helping him in his research is undoubtedly Richard Eno