Was this normal
My Fostermum often slippered me on the bare bottom from I was 10 until 12 for misbehaviour. She used a size 8 wedge type bedroom slipper that was all the style in the 70-80s and was bought as a present but was to big for her. Often she'd keep me bare bummed after to 'reflect' on why I'd been 'muled' as she called it. Found out later those wedge type slippers were called 'mules'