Violets are blue

Violet and Lorraine Morningdew are a wealthy couple with royal ties that live in a ornate mansion, a stark contrast to the small town they live near. But they still help out around the town, and are quite well liked around there. But everything changes when they hear a horrible noise coming from the cellar...

(A few quick CWs, this story contains gore, stalking, obsession, description of mental illness, main character death, widowing and SH)