100% sure you never heard of this before, but theres a romance manga called hotaru no yomeiri (firefly wedding) about a crazy hitman falling in love with a rich girl who he was told to kill. in the 2nd chapter, theres a scene where she wipes the blood off of his lips with a handkerchief (after murdering some people HAHA) to kiss him and it made me think “vampzuha would do that to hunterzou tbh”. SORRY FOR THE RANT.. the characters in the manga dont fit them, but i just thought that one scene would fit them well