My Darling [Black Butler: Undertaker and Grell Fanfic]

When they first met, Grell buried Undertaker in a salt jar, because the man wouldn't stop spouting nonsense. "Oh, how is this young man spouting nonsense? Every word I say comes straight from the heart." "You're doing it again!" Grell shot him a glare. "So what exactly did you say?" Sebastian asked. "Heh heh heh..." Undertaker let out a few strange, low laughs from inside the salt jar. "I told this red-haired beauty that I fell in love with her at first sight." One promise leads to a boyfriend. She'd thought her bargain boyfriend would be a gloomy, unsettling, irritating guy, but when she coaxed him into lowering his hair, it turned out he was so handsome it was almost criminal. Wait, wasn't it love at first sight? Why does this man seem to be hiding a secret about her... Theme: True love lasts forever, passed down from one heart to another.