"You see, Karyn, when the freak lab accident occurred, you and your sister were working with Jonnie and me as lab partners," Jon explained.
"That doesn't explain anything," Karyn objected. "It's not even possible. My sister is a senior in college, and she lives a thousand miles away. She wouldn't be taking high school biology, and certainly not in our school."
"No, I mean your twin sister Kayleen," Jon and Jonnie tried explaining at once. "The two of you were standing a little further away, and so the green cloud took a little longer..."
"Argh!" Karyn screamed as she suddenly fell to the floor. Jon and Jonnie sympathized as Karyn seemed to double up in two different directions at once, and then as duplicate arms and legs began to sprout. Moments later a second head appeared, and then the torsos separated.
"Pfew! That was weird," remarked Karyn, who found herself wearing a lacy little bra and a pleated skirt.
"Now I understand that stash of double-ended dildos," stated Kayleen, who was wearing a blouse and panties.
"Now, isn't this much simpler?" Jon asked.
"The two of you, me, and Stephanie will go to the fair with Jon, Gabe, Pete, and Eric," Jonnie explained.
"Have you forgotten I'm lesbian?" Kayleen reminded Jonnie.
"No, how could I forget our wonderful times together?" Jonnie stated softly.
Wait a minute, thought Jon. If Kayleen and Jonnie are going to be together, that leaves me Gabe, Pete, and Eric with Karyn and Stephanie. Unless...