Chapter 1: The Zipper

	During a rather sunny day, Kyoya, a lion guy decided to take a walk to his childhood friend house, Rein, a husky. Rein invited him to show him an invention that he had recently invented, not that Rein have explained what it is, saying that it is more fun to show it to him in person. Being a friend of Rein ever since they were really young, Kyoya have gotten used to Rein's odd yet fascinating invention that sometimes defies logic. Sometimes he worried that some kind of secret organization would kidnap Rein for his talent. Even though ever since they have grown old enough, Rein have used his inventions for rather... lewd things. Not that Kyoya complain, it is actually pretty fun for him to experience it, even if he did not admit it to Rein.
	Now that he have arrived at Rein's house, he clicked on the door bell, not long enough until he could hear a fast footsteps coming towards the door. A husky boy jumped to him. "Took you long enough!! I have been lonely~!", Rein says playfully as he pounced at Kyoya. Rein is a bit smaller compared to him, so he could still keep his balance. "C'mon dude, it was only 10 minutes after you last messaged me about this new invention of yours", says Kyoya as he pushes Rein away from him. "Oh right, the invention! Come right in! I can't wait to show it to you!", Rein gleefully says as he went inside the house. Kyoya could just sighs. As Kyoya enters Rein's house, it looks like a normal house with modern interior, that is, until he went downstairs where Rein's laboratory is. There are a lot of futuristic equipments. Rein is son of a rather well known scientist, but they mostly not at home due to their work. Which cause Rein to be really lonely, which is why Rein really appreciate Kyoya being there for him.

	"So? What is this new invention of yours?" Kyoya asked as he sit at one of the chair in the lab. Rein then scrambled on the stuffs on his table, then lift the item once he had found it. "TA-DA! A zipper!", Rein shouted proudly as he lift a rather long zipper to the air. "A zipper...? What's so uncommon about it?", Kyoya cocked his head. Rein then give a mischievous giggle, "It is not just a normal zipper! With this, you could turn any living thing into a skinsuit and you could wear them as if it is your own body!", Rein explained proudly. Another crazy invention... Kyoya thought to himself, does such thing is possible? Not that he is doubting Rein's ability, he had seen many weird inventions that Rein have created before. "What? Didn't believe me? We could try it here!" says Rein. "That's not what I meant- *sighs* alright alright let's try your invention like usual", he accepts defeat and just follow with the flow. "You says we could use it at any living being, then where should we try using it?", asked Kyoya. "It is a hassle to find a test subject right now, so how about you try it on me?", Rein suggested. "Y-You? Well... I guess you just trust this thing to even try it on yourself...", Kyoya scratches his head. "Alright let's do it!" shouted Rein as he gave the zipper to Kyoya and began to undress, slowly getting fully naked. Such sudden shocked Kyoya, "W-W-Why are you getting naked!?", as Kyoya looked away. Rein gave a confused look at Kyoya, "Since you have to stick the zipper on me of course, and you have to get naked too before you get inside me y'know." says Rein as he finished to undress.
	Kyoya slowly processing the situation and agrees with Rein as he let out a small sigh. Kyoya began to undress too, it is still a bit embarrassing despite they have naked with each other on many occassion when trying Rein's inventions. "So... I just have to stick this onto your back?", asked Kyoya as he looked at Rein's bare back. "Yeap, it should stick properly once you put it there, I will explain how to remove it later", nodded Rein. Kyoya could see Rein's tail wagging, seems like he is really excited about it. Kyoya then slowly put the zipper onto Rein's back, as Rein said, it actually stick to his back. Kyoya then slowly slide the zipper down that caused Rein to vibrates. "I-Is there something wrong?" asked Kyoya, genuinely worried about Rein. "O-Oh don't mind me, it's a bit ticklish hehe" Rein shook his head. Kyoya then continue to slide down the zipper, he then opened the hole from the zipper and looked inside. Good thing it doesn't looks weird inside, the surface inside looks rather rubbery. Kyoya then tried to touch the inner surface inside Rein, which cause Rein to jump. "GYAAHHH", shouted Rein. "Woah are you alright!?", he asked Rein as he pulls he hand back. "N-No it's just it is rather an alien sensation when you suddenly touch inside me, s-sorry please continue, I will try to stay quiet", Rein reassures Kyoya.

	"Well if there is nothing wrong I will begin getting inside you, though... would I fit in? I'm bigger than you, y'know", It is true that Kyoya is bigger than Rein. "Don't worry about it, the zipper would adapt your body to be able to fit in me regardless of the size", explained Rein. Kyoya then slides in his right leg into Rein's right leg, he could feel his own body distorted to fit Rein's body. As his leg fit into Rein's leg perfectly, he tried to wiggle his toes. "Woah! My toes moved on its own!", says Rein in a fascinated voice. "Yeah that's because I moved it, alright then I will continue," he insert his left leg. The next is... their dick... though Kyoya might to insert the hand first since it is hard to move from behind. He inserted his right hand into Rein's, then move it to Rein's crotch, while his left hand grabbed his own sheath to put it at the seemingly hole of Rein's dick. He could feels Rein is a bit embarrased when he touches Rein's dick. Then he slowly insert his sheath into Rein's sheath. Both groans at the sensation, it felt pretty good, Kyoya felt his dick combines with Rein's while Rein felt something is moving in his dick. "C-Can you do it quickly?", asked Rein, his canine dick is poking out of his sheath a bit and felt aroused. "I'm trying my best!", said Kyoya, feeling embarrassed too. Then Kyoya inserted his tail into Rein's tail and it began to shake vigorously, does Rein is enjoying this? Or perhaps Kyoya is? Kyoya can't really tell as his tail sensation began to merges with Rein's. All that left is the head. "Alright here's a tricky part, it might felt a bit hard to insert your head inside mind through my neck but don't worry about me, my body have gotten changed to be really flexible in such state" explained Rein to reassure Kyoya. Kyoya began to slowly insert his head inside Rein's. As he done, he slowly began opening his eyes, he could see a long muzzle in front of him, it is Rein's muzzle! "Woah- what-", said Kyoya but stopped midway as the voices that he could hear is Rein's voice instead of his own. Wait, how is Rein supposed to communicate in such state? "Don't worry I could still talk with you inside our mind hahaha", laughed Rein inside their head which shocked Kyoya, does that means they could hear each other thoughts? "Yeap, it is easier this way, now zip up and complete the process", commanded Rein. Kyoya then reaches the zipper behind and slided it up until he could hear a click. "And the process is complete! The zipper would camouflage itself so we shouldn't worry about people seeing it!" explained Rein.
	Kyoya looked at one of the big mirror inside the lab, in the reflection he could see a mirror image of his friend Rein, but now it is following every move he does, he could see Rein's rather slim body, common colored husky fur, and... a reddish dick poking a bit out of Rein's- his sheath. "Waddaya think? Pretty cool isn't it?", said Rein proudly. Kyoya gave a mental nod. "With this you could live a different life however you want! Even as feral animal!", explained Rein futher. Even as feral animal...? That does sounds interesting. But right now he can't get his mind of from his crotch, due to the process they have gone through, he felt rather horny, he is sure Rein felt the same too. He subconsciouly move his hand to his crotch before stopping midway, wait, this is not his own body... "Aww I was expecting you to do that, I felt really horny right now!", admitted Rein. "You sure are straight-forward aren't you?", said Kyoya. "Well this is one of the reason why I invented it! I wanna know how it feels to have sex as someone else!" replied Rein. "Though well maybe not here, it would be such a hassle to clean the lab later, let's do it in the bathroom".
	Kyoya agrees, he somehow know where the toilet is like it is at the back of his hand, perhaps their memories are somewhat merged too? Once they are in the bathroom, Kyoya grabbed one of the soap and rubbed it at his hand. He then slowly rubbed the sheath until a canine cock came out of it. The size is a bit smaller than his own dick, granted his body is bigger than Rein."I will begin it now", said Kyoya. "Go go!", Rein has gotten impatient. As Kyoya rubbed their dick, he could feel how different Rein's dick is compared to his, unlike his feline dick that is barbed, Rein's dick surface is smoother. Rein's dick feels so sensitive and he could feel Rein is moaning inside his head. As he keep on rubbing, bulges began to appear at the base of his cock, so that's how it feels to have a knot. Kyoya began to picking up the pace as he could feel they are almost reaching their climax until he could feel that something is arousing from inside his dick until ropes of cum shot out, making both Rein and Kyoya moans from the pleasure. The cums keep coming out after one and another. "H-How long will this keep on going?", asked Kyoya in confusion. "Well us canine cums a lot haha, give it 30 minutes or 1 hour", explained Rein. "What!?" said Kyoya who is helplessy trying to shut off his dick hole but cum just keep on coming out.

	One the ejaculation had died off, they took a shower and went back to the lab. "Alright tap twice on the area where the zipper is and it should appear again, you should be able to get out from my body" said Rein. Kyoya follows Rein's instruction and able to get out from Rein's body without any trouble. Kyoya then pulls the zipper from Rein body. "So what do you think Kyoya? This is so fun right?", asked Rein with a grin. "Yeah...", answeered Kyoya shyly as he looked at his side. "Though this is only the beginning! We are going to do field experiment with this later!" said Rein as he pointed at Kyoya who is began to wear his clothes again. "Field experiment?", asked Kyoya. "Yeap, we are going to try uses this zipper on random people!", explained Rein further. "W-Wait, wouldn't they realizes what we are doing!?" concerned Kyoya. "Booo you should have known I have got my own way with it, but I need some time to prepare for it, go back home now, I will text you when I'm ready with it!", pouts Rein as he also began to wear his clothes. 
	Rein then pushes Kyoya outside of his house and gave him a hug. "Thanks for playing with me today, it was fun!", said Rein happily. "It's no problem, I... had fun too", Kyoya replied shyly, doesn't want to admit his feelings. Kyoya then head back to his own house and waves back at Rein who is waving like a child. On his way back, Kyoya wonder what kind if field experiment he will have with Rein on later date.