"So my boobs aren't big enough for you?" you ask accusingly. You raise the flashlight.
"Wait, I didn't know!" Gene says even as you turn the pink light on his chest. His shirt quickly bulges up with the mounds of his growing breasts. "Please..." You keep the light on until he has a pair of C-cup breasts - wouldn't want your boyfriend's chest bigger than yours - and then shut off the light. "Please don't mess with my boobs." You grin wickedly.
"Your boobs?" you repeat. "And who says you ever had boobs in the first place?"
"What...what do you mean?" Gene asked nervously. "I've always had-"
"Really?" you ask. "You're a guy with boobs, and I have a sex-change flashlight, and the only explanation is that you've always had boobs?" Horror dawned in Gene's eyes.
"But I remember..."
"Of course you do," you say. "That's what the flashlight does - it changes reality for anyone not touching it. Now, are you going to behave or am I going to have to change more?"