She needs to stay wet for a while longer

"...I wish for you to have a vibrator in your cunt starting right now, which you won't be able to take out until the end of next period. And I wish it would slowly vibrate more and more until it makes you cum at the end of class."

Jessica gasped for a moment before having a brief shudder of pleasure and the vibrator started to buzz at its lowest setting.

"Oh... My... God... You are such an asshole!" she growled as she tried to get control of herself. She started to reach down for just a moment before glaring at Kevin, "You have to undo that right now!"

"Oh do I?" responded Kevin, smirking at her obvious discomfort, "Are you saying I should make another wish? Well in that case, I wish you'd lick it clean whenever you decide to take it out."

"Fuck off you pervert!" Jessica exclaimed panting as her juices dripped down her leg.

"Oh and I wish that if you skip class now you won't be able to take it out until you've sat through two full classes with it in you."

Jessica dropped to her knees moaning before opening her mouth to swear at Kevin but this time cut herself short.

"Better," Kevin added with a shit-eating grin, "So I guess I can be a little nice. I wish nobody can hear the vibrator but us. "

Jessica groaned with a combination of hate and pleasure as she came, a pool of her juices forming where she sat on her knees.

"Well I'm off!" Kevin added, laughing, "Have fun at class!"