What's next?

More rules (original concept by "monkey17", proofread by me)

You decide to add some more rules, after all she deserved it. So what if it affected others, this was just too good a chance to pass up.

New Rule: Diaper sluts have a mild to strong orgasm when they piss their diapers and a strong squirting orgasm when they shit their diapers.
New Rule: Diaper sluts get a number beer ass spankings twice there age when they get there dippers changed.

You watch as your mom puts your still naked sister over her lap and begins giving her 36 spankings. Your little sister was in tears by number 10. Once done, your mom finishes diapering her little ass. First by rubbing baby powder all over her ass and shaved pussy, followed by actually putting the diaper on. She then has her wear a pink sundress that only coved half the diaper, if that. You decide to add one more rule for now.

New Rule: Diaper sluts can never be left alone and will need a babysitter if no family or friends are available.

Your mom then askes you if you could babysit your little sister, as she was going out tonight. Beth then makes a fuss that she was having her friends over. You agree, planning to "play" with Beth's friends while humiliating Beth some more.