Twitter Smut - Diaper Curse
You weren't sure why this was in the 'Cursed Diaper' aisle. It seemed great - The diaper was slim, practically just underwear, and the spell on it would self-clean any accident. It couldn't be removed while it was 'in use' but that was no problem... right?
You paid for it, took it home, put it on. Tentatively, you gave it a try, and it worked great. The moment you had to pee, the diaper instantly wicked it away and was as dry as ever.  
Realizing you'd never have to take bathroom breaks again, you were pretty happy about it.
It worked just as well for messy accidents - Just as soon as the padding was full, *poof*, and it'd be clean. No muss, no fuss, not even a little smell.  
Naturally, the diaper immediately replaced all your other underwear.
Overtime, you stopped trying to hold it. Why bother? It was way easier to just go as soon as you had to, and your diaper would keep you clean and fresh. You didn't need to take it off to use your wand - it cleaned up better than tissues.  
Over time, the spell started to wear out. When you wet it, it'd be soggy for a few seconds before it self cleaned. Who cares, though? It's only a few seconds.   
Or, well. Ten seconds. 
Fifteen. 
Thirty. 
It doesn't matter if it's a minute before the self cleaning, right?
It seemed that it was thicker than you remembered, too - the puffiness started causing problems with your tighter fitting clothes. But, again - no big deal. You had looser clothes you could wear.
By the time you decided it was a problem, it was too late.  
Shifting in your chair, you pushed a mess into your diaper without even realizing you'd needed to go. Wrinkling your nose, you sat back, feeling it squelch, waiting for the cleaning magic to kick in.  
It didn't.
Ten minutes passed, and you started to get worried. At thirty, you were getting uncomfortable, and since it was 'in use', you couldn't even take it off and clean yourself the old fashioned way.  While you waited, you realized you were peeing.
Your thick, heavy diaper soaked it all up at least. But it swelled with the accident, and you finally knew you needed to take your diaper off. Problem was... you couldn't. After six hours, the mushy mess finally self cleaned, but that didn't do much good. It was still wet.
By the time it self cleaned from one accident, you'd had another. You couldn't help it. Worse, no amount of trying to hold it, to dehydrate yourself, to prevent accidents seemed to help - there was always at least a bit of dribbling pee in your diaper.
It kept getting worse. The padding got puffier, until none of your clothes would even fit. The length between self cleaning got longer. It wasn't long before the period between useage and cleaning was a full day. Even your messy accidents blurred together.
You couldn't remember the last time you weren't in a stinky, heavy, sagging diaper. No amount of counterspell magic could free you from it, either.   Waddling around, weighed down by the accidents that refused to go away, unable to hide your diaper from anyone.
Finally, in desperation, you went back to the store. People shopping there wrinkled their nose and gave you a wide berth, snickering at the adult in the puffy, poopy diaper.   You asked the shopkeeper for help.   Shrugging his shoulders, he told you only two words.
"No refunds."