No way are you letting her keep the ring. You might still miss her, but that doesn't mean you're gonna let an opportunity like this slip through your fingers. Besides, she's always acted superior to you, like she had to lower herself just to talk to you. It's time to put her in her place.
Moving quickly but quietly, you reach the corner just as Kim is coming back out with a glass of water. She gasps in surprise when you lunge forward, knocking the glass out of her hand as you grab at her finger. Realizing what you're doing, she tries to fight back, but you already have the ring in your hand. You jump back quickly, sliding the ring onto your finger and closing your fist in triumph.
"Hey!" she exclaims. "What was that for?"
"Just getting back what is rightfully mine," you say with a grin. "You thought you were so mature taking this, when all you are is a thief."
"Oh, come on," she said. "I was just making sure we made appropriate wishes. Let's be reasonable."
"You were making sure?" you repeat disdainfully. "What, like you're smarter than me? Well, guess again. I wish you had the mind of a ditzy bimbo."
"Like, totally not cool," Kim said, her inflection changing instantly to deliver a more vapid tone. "You shouldn't, um, use that thing on me. It's not fair." Her hand flew to her mouth as she gasped. "Like, what's wrong with me?"
"Sounding better already," you say, your grin broadening. "But I think you should look the part, too. I wish your breasts would grow a cup size." Kim gasps again as her chest is suddenly thrust out, her modest B-cup breasts now straining against her bra and tank top as a C-cup. You expect Kim to be angry, but her new ditzy self just giggles.
"You like my boobies, huh?" Kim says, smirking as she arches her chest forward. "You want me to take 'em out?" She grasps the edge of her clothing and tugs it down, letting each breast pop free. You can't help but stare at them, feeling yourself growing hard at the sight. What should you wish for next?