"Amy? Have you seen my phone any... Whereee..." Sarah asked not paying attention as she came into the transforming doorway. Her words trailed off as she looked up at the 20foot cyclops, the 7foot ball of dicks and the hellhound cerberus that all turned to look at her.
She stood there in stunned silence before her slack jaw closed and opened into a scream. She stumbled back on shakey legs readying to bolt down the hall, but was stopped by Amy who's giant hand reached out and curled around her stundded sister.
"Keep it down Sarah, you'll wake the neighbors with your yelling!" Commanded Amy in her giant's beratone voice lifting Sarah up to her eye(singular) level.
"Put me down you monster! Who are you? How do you know my name!" Sarah shouted, flailing wildly in her sisters clutches.
"Jeez Sarah, that's low. Don't you recognize your own sister anymore?" Spoke Amy making an act of turning her head in placing her hand across her collor as though emotionally pained.
Sarah paused for a moment taking in the cyclops that held her. The hair matched, her big eye looked familiar. Her facel features were distorted by said eye but the skintone was right. Something about her voice too...
"Amy? Is... Is that really you?" She said perplexed.
"Sure is!" Amy cheered. The reaction from the giant slab of muscle cyclops looking quite comical.
"But... But how? Your not some monster and furthermore what are those things down there."
"Those things!" Quipped one of Carmen's heads in an angry tone. "Are Carmen, and the ball thing is my boyfriend mark. He's indisposed at the moment."
"Your friend from school?" Sarah continued to question. Perpetually confused.
"It's a long story sis. Basically we all have this app that lets us transform ourselves and reality." She paused as to let that sink in. Just as Sarah opened her mouth to object or question Amy cut her off.
"Yes, how I know. But before you question this let me ask you. Was my room always this big? Or the doorway for that matter?"
Sarah stopped and looked around the large room. She went to start again but was cut off once more.
"That's right, 'no it wasn't'. That's because it was transformed into this and reality adapted to suit the change."
"Ok... Then prove it!" Sarah barked! Still unconvinced at how any of this was possibl.
"I was afraid you'd say that..." Sighs Amy. "Tanya, why don't you just show her how this works. Ill hold her still..."
Amy loosened her grip making a ring with her index and thumb around her sisters chest like a life preserver exposing her belly down while suspending her in the air.
Sarah kicked her legs now freed from the monster's grip. She quickly began to moan and cry out as Tanya had zoomed up in her tiny fairy form and began playing with Sarah's pussy.
Not wanting to cum herself Tanya messaged the giant folds of Sarah's snatch, kissing at the sensitive flesh with tiny mouth. As the teasing continued Sarah's clit began to emerge and Tanya set to it grouping the delicate organ tenderly until until she cam!
When she did Tanya buzzed backwards wanting to see the resulting TF and also not be made a mess of. Yet.
As Sarah came suspended in her sisters grip the four watched on as she began to moan deeply in pleasure.
The captive girls hips blossomed in size and extended rapidly each now half her body's with past her shoulders in wide birthing hips. Her pussy also engorged itself, quickly doubling in size and doubling again and again until is could easily accept a medicine ball if applied!
Her belly distended in equal size, the flesh becoming pink and jiggly with four beer bottle sized nubs poking out and sagging between her legs as an udder with the dimentions of an exercise ball!
Her feet swelled to twice their size and shifted into cloven hooves. Legs growing longer to support her new size. Lastly white velvety fur sprouted around her transformed lower half with patchwork black spots and a ropey tale above her butt. The anus within also swelling into a grapefruit sized doughnut of a pucker.
Sarah panted in her sisters hand coming down from her orgasm and transformation as milk steadily streamed from her four swollen teats.
Amy set her down watching her stumble on her new hooves pinpoint stance before fully releasing her hand. Sarah's cow lower half now took out 2/3 of her body's mass. The wide gate of her stretched out hips easily suited the new weight and girth of her udder which dangled only a few inches from the ground , a white puddle growing ever bigger beneath her.
"This, this is..." She stammered. "How! Am I on drugs or something!?"
"Ok, sis. Let me explain it real slow..." Said Amy getting down on her hands an knees to look her sister in the eye. Oblivious to her giant cock wedging itself between her tits pointed right at Sarah.