The human dog fusion had some time looking at their body, they could even make visible their shirt at will and noticed that it changed, before it was a plain red shirt with some details and symbols, now it was still red but had printed a small face of John and his pitbull Sam, it was a nice touch to keep in mind who was merged with the power of the shirt.
Johnsam wanted to test their treasure even more, and why not calling John's best friend Sasha.
Sasha picked up her ringing phone. "Hi John! How's it going?"
"Hey Sasha" Johnsam said in a different tone, a mix between masculine and feminine.
"Umm... Are you really John or someone else?"
"Uh, give me a minute" Johnsam wanted to try something, they hurried to take off the shirt after that they saw how the faces of John and Sam erased from the shirt and returned to its original design, meanwhile the fusion felt like an uncontrollable shake until they felt their bodies separating and reforming individually each one.
John was naked laying on the floor, he stood up and could see Sam in front of him, then he heard a "hello?" Coming from his phone and immediately took it. "Oh, hi Sasha!"
"Hiiiii, what was going on right there?" She giggled.
"Oh, I was just... Saying goodbye to a familiar that visited me for a little while"
"Right, it was weird I couldn't even tell if it was a man or a woman haha"
"Yeah... Anyways, do you want to come? And also bring your cat, how was he called? Alexis?"
"Haha no silly, is Alister, and yes I'll be there in a while"
"Sure" they hung up, meanwhile John waited for his friend to arrive as he got himself some normal clothes, leaving the treasure on his bed. Minutes later he heard the doorbell, it didn't take her so much as their lived close to each other.
"Hi!" Sasha said trying to hold her purse, holding Alister between her arms, a white cat with orange spots.
"Come in!" They walked to his room, Sasha left Alister on the floor and he started to play with Sam.
"They are so cute! And by the way, why did I need to bring Alister?"
"Well, there's something special I want to show you" said John grabbing the shirt. He shamelessly took off his normal shirt in front of her, they had an extremely high level of confidence, they even have seen each other naked without any problem, even so, Sasha wondered why he was undressing in front of her until he was naked but put on the red shirt he had on his bed. "Come here Sam! Let's show her."
Sam rushed jumping towards John, begining to merge, it had the same result as before, an anthropomorphic shemale dog with some of Johns facial features but also feminine, with a canine dick and vagina between their legs. "What do you think of my new treasure?"
Sasha gasped. "Is that a transformation treasure? So now I get the whole 'strange familiar' thing" she laughed.
"Haha yeah, I thought they didn't exist but amazingly I discovered this one this morning, it allows me to willingly merge with others"
"So cool! So... You want me to try it with Alister?"
"Sure! I want to test even more results with this" they took off the shirt, undoing the fusion and separating into John and Sam again.
Sasha did the same thing as him, she took off her clothes, bra and panties, showing her c cup breasts without shame to her best friend. Then she put on the shirt and held Alister, but nothing happened. "So, what should I do now?"
"Well, it seems like the one who wears the shirt can decide to fuse or not, so try think about being one with Alister, or being really really close to him, it's what works with me"
Sasha took John's advice, she felt and saw how Alister adhered to her, melting in her own body and becoming one until their bodies finished to merging.
The result was an anthropomorphic cat with a female shaped body, you could see the c cup tits of Sasha as the shirt vanished, also you could spot it was a shemale too, they had a pussy below their feline cock. "Wow" they could see the change in their voice, "this feels really amazing!"
"Yes! I knew you would like it" John said.
The fusion walked to the mirror looking the result, they looked great, they even tried to make the shirt visible as John told them that too, now it had printed Alister and Sasha's faces, they turned it invisible again. "So, I know that I can mainly control this body having some of Alister instincts and memories, but I feel that calling be Sasha would be wrong, so at this state you can call me Alisha!" They suggested.
"Sounds good to me, when I merge with Sam I go with Johnsam"
"Haha, it's very literal, but I like it. Well, that was fun" Alisha took off the shirt, returning to Alister and Sasha with the shirt falling on the floor."
"Now that we have this we can have tons of fun!" John said. "What should we do now?"
"Well, I have something in mind..." Sasha giggled.