This will take you to part three, and then each one will link to the previous part. https://www.spanking-emporium.co.uk/spanking-emporium/?p=10431
The relationship is explained in part one,
Once the knickers were removed, Mummy began to spank her daughter in earnest. Mummy enjoying the experience as much as her submissive daughter, who pushed up for every stinging smack.