Fiona knew this boy was horny and it made her wet.
"I'm Fiona, what's your name?" she asks with a flirty grin.
You babble out your name incoherently as she giggles sweetly.
"I was getting pretty bored.... playing with myself.... wanna play too?" Fiona asked.
"S-sure." You mumble, your blush as hot as the sun.
"Good, then put this on." Fiona said as she pulled out a green and yellow striped sweater.
"Why? You asked.
"It's a fetish thing..." Fiona grinned with a phony blush.
You pulled off your shirt and slipped the sweater on with no issue. It was nice and warm, a stark contrast to the chilly air. It was so cold that your nipples were hard, even with the sweater. Except your nipples don't really tingle like that... never tingled they way they were now. You reached up to touch them, but realized your hands were pale white, slender, and as dainty as Fiona's. That sickly white hue spread across your *skin color* skin, as your hair turned the same shade of brown as... Fiona's... and grew out to... look like Fiona's... and holy s***, whopping DDs lifting and hanging out of the now skintight sweater!
"You're coming along nice." Fiona smiled with a pink glow in her eyes.
You were confused unil your crotch burned like it was lit on fire. Not just that, but it was pulling inside you and splitting apart within your body. You yank your pants forward to see your dong completely gone, a tender leaky pussy in it's place.
"What the hell?!" you ask before covering your mouth: you sounded like a woman. You looked in the mirror to see a face nearly identical to Fiona's, except for red eyes and (of course) paler skin. You moaned as your ass and thighs swelled up to be as big as hers. Your pants squeezed your bottom tight as they turned brown along with your shoes which became flats. Your hips bulged out and your waist bowed inward.
"Why the hell do I look like you?!" You screamed.
"Don't you like being sexy? Doesn't it feel good?" Fiona asked as she groped you hard enough for you to drool. Fiona pinned you in a kiss and jammed her fingers into you new clit. It was weird! It was uncomfortable!
It was...
*curse induced pink eye glow*
... so damn hot! You grab your twin and kiss her right on the lips, probing eachother's mouthes while rubbing her pussy and hearing her sexy little moans. That's when you two lift your sweaters to expose your perked tan and pink nipples. You bite them, suckle them, lick them, it's so gooood....