Painfully!

Batgirl waddled out of the joke shop with her green and yellow frilly MLP panties and bra filled to the brim with itching powder, and her yellow boots filled with water. Batgirl didn't even try to hide her embarrassing panties as she walked down the empty street towards the nearest alleyway. Once in the empty alley, Batgirl quickly unclipped her bra and shook out the cups. Her poor little nipples were puffy from the irritation and scratching. Then Batgirl bent down and whisked her panties down and off. The amount of powder that was now at her feet was ridiculous. Batgirl stared at her red and irritated pussy and crotch with tears in her eyes. There were little red bumps all over her private parts. Just then, Batgirl heard a noise coming from the street and ducked behind a dumpster. That's when reality hit her. She was standing butt naked in an alleyway in just her yellow boots and mask!

Batgirl waited behind the dumpster for a minute and didn't hear the noise anymore. She then grabbed her yellow boots off and dumped the water over her body to stop the itching. Her soggy socks fell out of the boots and she just tossed them into the dumpster. Batgirl then looked at her underwear and with a sigh, put them back on. There was still powder residue in them and she felt a dull itch constantly. Batgirl climbed up a nearby fire escape and made it to the roof. She's a long way from her apartment and yet again she's in her panties and bra. Batgirl knew she had to start her trek home. She could capture Harley tomorrow. Batgirl took her first step but a sudden CRACK slashed across her ass and she screamed out in pain.

Batgirl looked behind her and Catwoman was standing on the roof with her whip and a small dark bag. She set the bag down and then whipped Batgirl's ass again. The whip was so strong it tore a small hole in her frilly panties.

Batgirl pleaded with Catwoman, "Owww! Please not tonight! Please let me go!"

"What's the rush Bat-brat? Don't want anyone to see you in those dorky panties? Or is it you want to get home to wash off Harley's Itching powder? Yeah, I watched what she did from the vents. Harley always has such a creative mind when it comes to uncomfortable pranks, doesn't she?"

"Please, just, please let me go home. My ass hurts so much from the powder already!"

"Oh honey, Your ass doesn't know that word yet! You put me in diapers, in fact I'm still in them (Catwoman turns and shows the puffy outline of the diaper from under her costume), so I think it's fair that I spank you so much that you'll voluntarily wear diapers' just for the comfort they'll bring you!"

Catwoman whipped Batgirl across the ass again, tearing a large portion of her panties off in the process. Batgirl howled in pain as she could see her ass grow bright red. Batgirl tried to get out of the way, but she was exhausted and too slow. Catwoman whipped her 14 more times across her ass until her panties were torn off and her ass was firetruck red. Batgirl sobbed in the fetal position and felt the welts across her ass. the subtle touch made her wince in pain. Catwoman pit her whip away and seductively approached Batgirl on all 4s carrying her black bag. She pulled out a light purple pullup with the Wonder Woman logo on them and a bottle of lotion.

"Here you go, Bat-girl. I suggest you lotion your ass good multiple times a day and you wear a diaper or pullup for about a week. Because trust me, hon, you WILL need a cushion to sit on. Now, ta-ta dear. Don't be a stranger!"

Batgirl sniffled and wiped the tears from her eyes. She laid on the rooftop with her spanked ass and itchy pussy exposed to the cool Gotham air. After a few minutes she mustered the strength to roll over and felt the stinging in her ass. She grabbed the lotion and very slowly and carefully applied it to her ass and crotch. Then she put the pullup on. There was a noticeable difference with the embarrassing baby item on. Batgirl then slowly and painfully made her way home. She had a big decision to make in the morning.