"Okay, yeah, I did use it," you admit. "I, uh, wished that you would be naked." Seeing her expression, you quickly continue, "But I immediately wished you back to normal!"
"Oh, well, that's okay then," Kim says, seeming to relax.
"Really?" you ask, surprised.
"No, not really!" Kim snaps. "You humiliated me! You violated my privacy!"
"It was an accident, I swear!" you say. "I didn't mean to do it."
"Oh, I'm sure," Kim says sarcastically. "And I suppose you'll also say that you would never do it again?"
"I wouldn't," you say quickly.
"Let's just see about that," Kim says. She glances at the ring and takes a breath. "I wish you would tell me honestly whether you would do that again if you had the ring and I didn't know about it."
"I would totally wish to see you naked again," you blurt, unable to stop yourself. You gasp. "Wait, no, I didn't mean that!"
"Yes, you did," Kim says. "You still fantasize about me, don't you?" She spreads her arms. "Well, go on, have a look. Fantasize some more. In fact, I wish you would fantasize about my body the way you normally do. I wish you would hold that picture clearly in your mind."
Unbidden, imagery springs up in your mind. It wasn't just an image of her naked; it was a detailed vision of every lustful thought you still carried for her. You envisioned her long hair as a natural blonde, longer than it normally was. You saw those kissable lips just a little fuller, almost pillowy in the softness of their touch. The breasts, of course, you envisioned larger, a C-cup instead of a B, with perky nipples that stiffened at the briefest hint of stimulation.
You struggle against the forced imagery, even though you know it's your own fault, but the wish wouldn't let you stop. You find yourself imaging Kim's eyes glazed over with lust as she drops to her knees in front of you, her voice huskily begging for your seed...
"Now," you hear the real Kim say triumphantly, "I wish that you would stop fantasizing and become that fantasy version of me."
"Wait, no!" you gasp, but the wish has already taken hold. An itching begins along your scalp as your hair begins to grow, while at the same time you feel yourself seeming to shrink and grow shorter. Your shoes feel loose as your feet grow smaller inside them, and your jeans loosen. "I'm sorry, okay! Change me back!" Your voice cracks as you speak, jumping up an octave and softening. Your hands fly to your throat, which has grown smooth without sign of an Adam's apple. Under your fingers, you feel the light stubble fade from your shrinking chin, even as the fingers you feel on your chin seem to shrink.
"Hey, this is your fantasy," Kim says with a smirk. "You should enjoy the chance to see it in reality."
By now your pants have loosened to the point of almost falling, but they are stopped by the abrupt widening of your hips. Your now-slender hands drop down to feel in horror as your butt swells under the denim, gaining plump feminine proportion. There is a tingling in your groin, and you quickly pull the waistband of your pants out so you can look down your front. As you watch in continued horror, the modest bulge of your cock and balls shrinks and dwindles away, leaving your boxers to hang limply against a flat surface. No, not flat...you can feel the shifting sensations moving up from your crotch into your lower abdomen, and you know that there is now a fully-formed feminine reproductive system where there had once been only male.
Your waist caves in, creating the distinct feminine hourglass shape - not that you can see it under your shirt, which now looks tentlike on your much smaller body. You press your hands to your flat stomach, feeling the last of the fat melt away. The action tugs your loose shirt against your body, revealing the start of the final change. At first they are just little mounds, lightly tenting the shirt. Then they begin to swell swiftly, pressing out against the fabric as they round out. When they finally stop, heaving with every gasping breath you take, you can even see the nipples poking through the fabric.
"Blonde, really?" Kim says, sounding a little disgusted. "And bigger boobs. You are so typical of a guy."