"No peeking!" Lisa giggled as she hurriedly began typing into the computer. Eric fidgeted as he stayed seated on the bed, waiting for Lisa to finish with the computer. Her occasional chuckles and sideways glances at him only served to make him more edgy. Finally, his curiosity got the better of him.
"C'mon, what is it already?" Eric asked nervously.
"Almost done...there!" Lisa said with a flourish, then turned to face Eric. "Well, at least this'll solve the problem of your mom not wanting me over here," Lisa grinned. "She can't object to me being here now!"
"What do you mean?" Eric frowned, but Lisa had already reached over to hit the "Enter" button. Before Eric's eyes, Lisa's entire body began to shift, like it was an image in a computer morphing program. Her hair slowly darkened and shortened, as her frame began to lengthen. Lisa shivered with excitement as she felt her body change proportions. Suddenly, her chest flattened and an Adam's apple began to bulge out of her neck. Eric stared wide-eyed as he looked down to realize Lisa was no longer a girl.
"You changed yourself into a guy?" Eric gaped, but Lisa cut him off.
"Just wait a bit more, that's not all," Lisa grinned through the strange sensations as her voice began to drop in timbre, but then felt her - now his - face begin to shift slightly, and closed his eyes as his internal organs joined in the act. Eric couldn't believe what he was seeing. Just as he thought the changes had finally ended, a quick ripple passed through Lisa's clothes, changing them as well, and the ripple seemed to flow out of Lisa and through the entire house. Finally, Lisa opened his eyes, and Eric realized to his shock that he was looking at a picture-perfect copy of himself, down to the clothes.
"Lisa?" Eric asked, unsure.
"Better call me Lee now," Lisa said in a voice which matched Eric's perfectly, "Brother dear!" At that second, a string of memories poured into Eric, memories that hadn't existed before that moment, and which Eric knew weren't real, but were as detailed as any existing ones. Memories of growing up with his twin brother Lee, who he was closer to than anyone else in his life. However, at the same time, Eric also knew that until a few seconds ago, Lee had been his girlfriend Lisa.
"This is...weird..." Eric began, not certain what to make of the sudden changes.
"Now, now," Lee cajoled, walking over to Eric and pulling him up from the bed. "Just think of it this way, now we get to spend a whole week together, since how can 'Mom' object to her twin boys living in the same house?"
"Mom?" Eric questioned.
"Of course," Lee explained. "I changed everyone's memories for the week so everyone thinks we're twins, only you and I know Lisa exists. Of course, now you get to have your 'girlfriend' with you 24/7."
"I can't believe this," Eric exhaled, still staring at his mirror image.
"Better believe it, my lovely twin," Lee grinned, then pulled his t-shirt over his head to reveal a smooth chest . "And we have a week to make the most of it, so let's get started." Lee pulled Eric close, then kissed him tenderly.