I just remembered of a manga that I started reading but never finished (also if I don't remember why, maybe I couldn't find the rest?)
Unfortunately I only vaguely remember the plot.

I remember that there was a vampire (or a demon?) following this guy home and basically falling in love with him and I think the human was quite shocked of him being a vampire (or demon?) and there was something about the vampire/demon protecting him from others vampires/demons because he was 'his' (like his prey? or marked somehow?). Gosh, I wish I could remember more! I also remember that, at least in the first part, the story had a light humorous mood.

In case my description is too vague, may I ask for some good vampire/human or demon/human (or demon/angel) yaoi/shounen ai manga?

Camelot is a silly place

Maybe Radical Blood Monster?

you are an angel thank you! 😀 D It's exactly that one <3<3
Now I feel quite silly because Mishima Kazuhiro is one of my favourite mangaka and I didn't even think of looking in her list of manga
(also, I love your nickname!)

Camelot is a silly place