Please recommend a novel where the male lead has a voluptuous figure?

In modern urban novels, the male protagonist started off as an ordinary person. Later on, he met a group of people who were hunting down another group of people. In the end, he became a vampire-like race after coming into contact with one of them. There was also a girl who specialized in sucking blood for them. In the beginning, the female protagonist called Moonlight and seemed to use a machete. Later on, she died. There was also a male supporting character who was a pretty cool magician. Later on, in order to save the male lead, he sacrificed a lot of himself.
The male protagonist was a fatty, but he slept with a very powerful woman. Later, that woman died, and when the male protagonist exploded, he could turn into that woman.
She had read a novel in primary school, so she couldn't remember the details.
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Answer 1

I recommend "The Reborn Fatty in the Tang Dynasty" to you. The male protagonist is a fat otaku who was killed and reincarnated to the year 626 AD. It is a historical fiction novel that helped the Crown Prince to ascend to the throne. I hope you like this fairy's recommendation. Muah ~😗