"What I'm thinking," said Jon with a smirk, "Is that we just ditch school for the rest of the day."
Karyn smiled. It was pretty silly to hang around and go to classes when they could literally do anything they wanted, even if one of those things was having the reluctant mercy to return Biff to his proper size and shape and probably make him forget that his locker room run-in ever happened.
"And what, exactly, do you propose we do with Biff now?" Karyn said.
"Leave him," said Jon, "We can just wish it never happened."
"I'd like to make as few wishes as possible, if that's alright with you," said Karyn, "After all, it's better when we can do our own reversals."
"So you want to just walk out of here with that thing?!" said Jon, motioning the large cock and the tiny dick that hung off it.
"Oh yee of little faith," said Karyn, sauntering over to Jon's locker and grabbing the magic ring, "Wach this!"
Karyn gingerly slid the ring onto Biff's swelled member and, (literally) like magic, he vanished. Karyn reached out to where the cock was and wrapped her fingers around it, meeting with the invisible flesh. Tiny squeaks could be heard from the bench, but they were barely audible.
"And what about you?" Jon asked, "Your clothes aren't in here."
Karyn smiled back as she set the invisible Biff back on the bench and turned to Jon, moving in seductively.
"Silly Jon," she teased as she unbuttoned his shirt, "I'm gonna borrow yours!"