I remember reading a doujin on nhentai.net. The main guy got into an accident, then got saved by a vampire. This vampire started to explain what she is, how the main guy got saved from the accident by becoming a vampire serving her. Of course the main guy didnt believe it, so the girl started using command spell or sth like that. The guy noticed her missing arm, so she explained her backstory. She got into accidents or sth and lost her arm, she could regrow it by drinking blood, but her mother taught her not to do it cause its wrong? I dont remember this part well @@ the main guy then decided to offer her his blood, she suck his, he got boner then they fuked. About the tags of the doujin, it should have small breast in it cause i like reading around that tag. But i could be wrong about it
I remember reading it years ago, now i cant find it