You see Melissa point the flashlight towards you and realize what's about to happen. You had been lucky enough last time that the flash was so brief it didn't do anything noticeable; what if she leaves it on longer this time? Quickly you reach out and try to grab the flashlight from her.
The beam is already on by the time your arm is even halfway extended, bathing your chest in its pink glow. Although you don't notice, Melissa watches in facination as the buds of your smallish breasts swell against your shirt, growing a cup size before your hand reaches the flashlight. As soon as your fingers touch the warm plastic of the case, you instantly become aware of the way the breasts are swelling on your chest.
"Hey, cut it out!" you exclaim, pulling on the flashlight.
"You ARE growing boobs!" Melissa says in shock. Her surprise makes it easy for you to snatch the flashlight away, but the beam is still on your breasts (which are visibly rounded against your shirt as they fill out). In the second it takes your finger to find the switch and shut it off, reality alters; now Melissa thinks you've always had breasts like this, even though she knows she changed the rest of you.
"This isn't just a toy!" you tell her hotly. "This can change reality!"
"Okay, I get it!" Melissa said. "Sheesh, calm down. I already saw it change you."
You feel your blood run cold. She saw it change you? What did she change? You look down at your body searchingly. You remember changing your cock into a pussy (accidentally), but that was actually a change you didn't mind since it made your genitals more compatible with the rest of your body. But what if the rest of your body wasn't your body?
"What's wrong?" Melissa asks with concern as you drop your head into your hands.
"Just . . . quiet, will you?" you say, rubbing your temples. "I'm trying to think." You realize grimly that you have no way of knowing what Melissa changed. You could be completely different for all you know. The only way to fix things...is to trust Melissa.