Layla (18), Chelsea (20) and Rachel (18) were best friends since childhood, always sharing their passion of animals and all related to them. As they grow up they discovered their kinky interest for furries.
They were interested in the animal transformation program, but before they made their decision they saw the announcement of the new merging option, wanting to choose that over the individual one.
They wanted to be dominant in their new form, even Chelsea that was the most calm and cute of the trio. Something intimidating as they had to deal with many problems just for being women, social pressure, beauty standards, stalkers and many things that they could fight against if they were stronger, that just fueled the idea of their transformation.
After talking about it they made a decision, if they would be a three headed anthropomorphic creature... Why not a Cerberus? A male and strong one that could inflict fear to the ones that would go against them, the thought excited the three girls and decided to go for it.
Now in the transformation center they had to sign some papers, including some rules and a disclaimer, things they already knew, then in the last page they had to fill the paper with the details of their transformation.
Subjects: Layla Adams, Chelsea Hillson and Layla Stark
Merging details: an anthropomorphic three headed Cerberus
Height: 7 ft
Gender: male
Age: 20
Control: Chelsea will control the left arm, Rachel the right one and Layla the legs
Additional details: muscular body. Chelsea will be the left head, Rachel the right one and Layla the middle one
After writing all they needed the girls or soon-to-be males were guided to a hall with many rooms, each one represented a transformation room where they managed to see some people coming out of them, happy with their new merged forms, that was a good sign for them.
A nurse-like employee was the one attending them, they saw how she grabbed a syringe with a wolf symbol, injecting a part of it to each girl until it emptied. Then the nurse left three flask with a red fluid in it. "Just for you to know, after you see a noticeable change in your body you must have physical contact with each other. I'll leave you some time alone" she left the room saying that she would come back later.
"So, is that it? I don't feel anything!" Rachel was starting to get stressed.
"We just have to wait silly, I hope the changes will be quick" Chelsea giggled.
"That's right" Layla stood up from her seat, "so why not removing this babes~" she said teasing to take off her shirt.
Chelsea blushed, "What do you mean?"
"Well, we will no longer be women after this, not even human, so why not looking how our changes are done with a full visual?"
"Heh" Rachel nodded. "I agree!" She said taking off her shirt, showing her breasts to her best friends since she wasn't wearing any bra, then took off her pants and panties, revealing her small bush of black hair in her pubic zone. "First!" She said after being completely naked.
"I like your style, you forgot to shave don't you?" Layla smiled taking off her shirt and bra.
"Why does it matter? We will be covered in tons of more fur later" she responded.
"True!" Layla keep undressing until she took everything off, showing the girls her firm C cup breasts and shaved clean vagina. "Second! There's just one left!" Layla and Rachel looked at Chelsea.
Chelsea blushed even more, "okay okay! I'll do it!" She said shaking as she slowly removed her shirt and bra hugging her small but cute B cup tittes, then she lowered her skirt and panties, having a trimmed blonde pubes between her legs. "Th-third..."
"Woohoo! Now we just-" Layla felt something in her arm, bringing to grow black fur that was quickly extending through all her arm.
Chelsea and Rachel noticed changed on themselves too, Rachel's crotch grew an immense amount of black hairs that extended to her legs, while Chelsea began to grow a tail and her nose was replaced by a snout.
"Now! We should do it!" Layla said to them, positioning themselves one behind the other, Rachel in front, Layla in the middle and Chelsea at the end, touching their backs with their chests.
The merge was fast, their torsos began to combine into a single one, absorbing their limbs and arms, positioning the three heads between their now shared shoulders in the order they wrote. The fur kept spreading, having their legs and arms covered in black fur that extended to their chest, where their shared pair of breasts deflated until it was a masculine flat front, their skulls reshaped into a canine form, taking the form of black dogs as the fur went there too. Finally their crotch having a vagina sealed, growing a canine 8 inches dick replacing thier previous feminine sexual organ, the male hormones flowed through their body gaining musculature and affecting their vocal cords, sounding more masculine as they moaned from the pleasure the change caused.
Chelsea couldn't resist and grabbed their new big and throbbing red cock, instantly cumming after resisting the urge during the transformation.
The trio opened their eyes, first looking at a puddle of semen on the floor, having their left hand covered from the same fluid.
"Jesus Christ!" Rachel exclaimed in her new deep male voice, "look at the mess you did!"
"I'm sorry!" Chelsea sounded like a boy more than a very masculine man. "You felt it too! I couldn't resist"
"Hey stop fighting, just look at that" Layla pointed at a mirror in front of them, noticing the creature they turned into. Their wish was granted, they were an anthropomorphic, strong, back three headed Cerberus, with a still hard penis between their legs.
"Is that... Us?" Chelsea was amazed.
"Hell yeah girl! Or should I say boy!" Rachel smiled flexing their strong right arm.
"This is incredible! Now we will be together forever!" Layla jumped in excitement, having total control over their legs.
Seconds later the nurse opened the door, looking at the mythic and tall beast in front of her, her sight lowered to the floor noticing the cum leaking through the floor, Chelsea was embarrassed. "Oh! Don't worry, this is more common that you think, we will clean this later, so enjoy your new form and thanks for visiting our center!" She gifted the Cerberus a card containing the contact of Animalia INC in case they wanted another change or make a recommendation.
The triple creature left the center, being able to walk naked without any problem to worry about, the people that looked at them were amazed, some wanting to take a picture with them, flexing their muscles in the poses, others were inspired by such empowered beasts, the three previously called girls now boys couldn't enjoy more their decision.
"What should we do know? I have a couple of ideas" Layla asked to the heads at her sides.
"We could go to the gym and get stronger!" Chelsea exclaimed. "I'm also curious how it feels to pee standing up"
"Or get in a fight! Let's see who wants to stalk us or challenge us" Rachel made a fist with the hand she (now he) was controlling.
"Maybe hitting on some girls~" Layla suggested, they weren't into girls before, besides Rachel that was bisexual, but the male hormones flowing in them opened their desires of mating with a willing female, maybe they wouldn't have a problem with a male either. They had a new wide range of possibilities now.