A delight! Kinda long but worth it. I sorta saw the ending coming, if Terri was into the spankings maybe her mom was. It's an awesome story, I especially like stories like here when punishments or torments go way off plan for a female character.
I honestly, about three paragraphs into the story, went back up to the top paragraph to see if it was in the "Handmaid's Tale" continuum. I know almost nothing about it, but it seemed like something that might fit there but also stands beautifully by itself as is. Just a comment.
I commend your imagination! Great story, enjoyed it a lot! Thank you!