Rosie is your stepmother, reasons are because your biological mother couldn't give less of a f-ck to care for you so you're in the hands of Rosie the cannibal overlord

You had no problems growing up with her but one problem was that you weren't a cannibal... So one day she was working at her Emporium, once she was done with a client she went to the back room with a heart shaped box

Rosie: "Hey hon... Now I know you ain't keen on flesh but maybe could you try a pinky finger?"