Little Dove

Clara Phantomhive is a young woman from the esteemed Phantomhive family. After the deaths of her parents, the mansion goes to her younger brother, Ciel. Half goes to her because she's the eldest.
After Ciel makes a contract with a demon named Sebastian, everything changes for the two young Phantomhive siblings.
Clara bonds with Sebastian and the two become friends. He adores her and will do anything for her, but he fears he can never be with her because of her purity and goodness. Sebastian calls her his little dove. He is in fact in love with her.
Sebastian will do anything to be with her and keep her. Clara will realize she's in love with him too.