Misty was looking in the mirror, changing her clothes. (Or something)
She was changing in a small room at a Pok mon center.
"Were my breasts always this huge?" She asked herself.
"No." Her reflection answered.
"Ok, 'didn't think- Who said that?"
"The mirror."
Misty looked at the mirror. Her reflection copied her every move, until the other her stuck her tongue out.
"What the hell? Who are you?"
"Me? I'm Kasumi. This "mirror" is actually a second dimension. Watch."
Kasumi reached out and grabbed one of Misty's breasts.
"Why are your's so small?" Kasumi's were much larger than Misty's.
"I... I dunno! What're you doing?"
"Groping you."
Kasumi continued to play with her other's breasts. Soon she walked out of the mirror. Both were naked.
"You know, I've always wanted to make out with a girl."
"Me too..."
"I know."
"Then let's try it..."
Kasumi slipped her tongue into Misty's. She had one of her hands on her other's breast. Misty did the same, though her hand was squished between both sets of boobs.
Misty eventually moved her hand downward to play in her other's "cave." Kasumi copied her movement.
Both of them were moaning loudly. Copying each other's movement almost perfectly.
"Misty!/Kasumi! Are you done changing yet?"
Kasumi's eyes snapped open and she ran back into the mirror.
"Yeah, almost, Ash/Satoshi! Just hold on!"
Misty looked at Kasumi, and they both blew each other's a kiss at the same time.