AesSedai's manga / #Curse(2)

FL is cursed with immortality and goes to work for the prince who is cursed with killing things. A match made in heaven. Unfinished. Someone's come back to take this over; ongoing, ch34

Devil lends his heart to human baby, but ends up raising then falling for her. The story is set with them looking for her devil, she finds out who he is towards get end.