She is punished for her lack of initiative

"... had a bare ass."

Jessica gasped with the stimulation of the wish and the sudden breeze on her butt. A hole had appeared in the back of her latex outfit, allowing easy access.

Valerie grabbed her arm and pulled her towards the hood of the car, using one leg to nudge her feet shoulder-width apart. "I wish you couldn't move your feet from this spot until I said otherwise." She fetched a piece of cord from her glove box and tied Jessica's arms behind her back in a complicated pattern that kept her hands up out of the way and wrenched painfully at her shoulders. Then she grabbed a handful of hair and bent Jessica over, pressing her face against the cold metal hood of the car.

Close to her ear, she whispered, "You've disappointed me. I finally gave you the chance to be the depraved whore we both know you are and you chose to be boring. It is time for me to show you that that was a mistake."

She fetched something else from the car, and waved it in front of Jessica's eyes -- a thick wooden paddle, covered in metal studs, "I wish this couldn't break your skin. I don't want blood on my car."

Jessica moaned -- partly in dread, but mostly from the pressure of the zipper on her clit and the stimulation of several wishes. She would've come by now, if she didn't need Valerie's permission to do so.

Valerie rubbed the paddle against her ass. The studs felt a lot bigger and a lot harder than they'd looked.

"I'm going to spank you with this ten times," she explained. "Every time the paddle hits your ass, you are to count the number and say 'Mistress'. If you mess up, we start again. Do you understand?"

"Ye -- agh!" Jessica screamed as the paddle hit her bare flesh, much harder than she'd anticipated.

"Aargh! Gah!" Valerie had hit her twice more.

"Better start counting or we'll be here all day!" Valerie said, smacking her harder.

"One!"

She hit again.

"Two!"

Valerie let her get up to nine before stopping. "Now, do we see the mistake we've made?"

"What?"

"Your instructions were to shout 'one, Mistress!' 'two, Mistress!' You've not counted a single strike yet. Better start from the beginning, and do it properly this time."

"But that's -- argh! That's not fai -- argh! One, Mistress!"

Smack!

"Two, Mistress!"

This time, Valerie stopped at seven, "Hmm, this isn't right."

"What?" Jessica gasped, barely able to think.

"It isn't right. Something's missing. Oh, I know -- I wish that whenever you said the word 'Mistress', you got hornier. Now, where were we?"

"Seven."

"Seven, what?"

"Seven, Mist -- gnnn --- Mistress. Ah!"

"You might be right, but since you've already shown you can't count properly, I'm not inclined to believe you. Start again at one." Smack!

"Please -- "

Smack!

"One, Mistress!"

This time, it was much harder. Jessica had already been on the edge of cumming, held back only by Valerie's wish, and now every strike was a flare of intense pain followed by a flare of intense need. Soon, it was all she could do to listen for the smack and count the next number, both pain and arousal sharply increasing each time. So she was very confused when Valerie stopped at eight.

"What was that?"

"E-eight, Mist-ah-Mistress."

"No, it wasn't. I hit my car tire, not you. Pay attention." She checked her watch. "At this rate, you'll make us late for class. Start again." Smack!

She tried to trick her with the tire trick again at six. She tried to trick her by hitting her across the back of the knees at eight. Nine and ten came in quick succession, so that it would be difficult for Jessica to count nine before ten -- but she made it. She gasped, "Ten, Mistress!" and flopped, exhausted, to the roof of the car.

"Disappointing," Valerie said. "I knew you were a bimbo, but I didn't realise it was this hard for you to even count to fucking ten. We're going to have to do this more often, to teach you some basic math. I wish the **** could move her feet again."

Jessica dropped to the ground. She was unable to protect her face from hitting the dirt with her still-bound hands.

"I wish the ****'s ass and slutty cunt were covered up again."

The latex suit repaired itself. Jessica moaned into the dirt. The tight rubber over her extremely bruised ass was agony; the tight rubber over her drenched and severely swollen clit and labia a different kind of agony. Valerie looked down at her in disgust.

"Wow," she said, "A little bit of rough play and you're an absolute mess. I suppose you want to come now, hmm?"