Derpy, Derpy… I don't think you're going to need your shorts anymore. The diapers will be enough; they'll function as the only clothing you'll ever need on your bottom half from now on. Also as a cushion for sitting, and of course they've proven to work really well as your potty. Not to mention they'll eclipse your monthly sanitary products in effectiveness in every conceivable way, including a practically nil possibility of toxic shock. They'll also work as something quite stiff (but very soft) to rub against when looking at certain ponies you like, and… since you can't remove them yourself… they'll even work effectively for chastity. All wins!

Art by Smudge Proof. He's friendly, courteous, and hard-working. Check his stuff out!