Roommate into a Bio-Furniture! (with story)

When I got home from work, I turned on the light in the dark room. It seems that the man I share a room with hasn't come home today either.

My friend, who is also a strange scientist, often wanders off and doesn't come back, or he'll disappear for a few days to immerse himself in research in his university lab, so I wouldn't normally worry about him, but it's unusual for him not to even reply to LINE messages.

Has he had an accident...?
As I finished getting changed and wandered around feeling uneasy, my eyes caught sight of an unfamiliar sofa sitting in the corner of the living room in place of my friend.
It was a shiny black sofa that seemed to be brand new, reflecting the light as if to say that it had just been polished.
I thought it was leather-covered, but the surface, which was unusually smooth with few wrinkles, gave off a faint rubbery smell when I held my nose close to it, and there was a memo on the seat.

'This is a sofa made from a new material I developed. Please sit on it and let me know what you think.'

I sniffed at the end of the simple message, which was signed by my friend.
It seems he is fine. I wasted my time worrying about him.

As my friend had hoped, I turned on the TV and sat down on the sofa.
The sound of the rubber squeaking echoed around the room, but for some reason it made me feel as if I was hearing the sighs of pleasure emitted by some living creature.
My back sank deep into the seat, but the sofa's moderate elasticity pushed back against my weight, supporting my body at a natural and comfortable angle.
For a while, I changed my posture by leaning on the armrest or tilting my body while watching TV, and each time I did this, the sound of the rubber creaking could be heard as the seat, armrest and backrest deformed to a moderate degree, giving me a comfortable fit without any strain.

It doesn't seem like there's any machinery inside, but is this the characteristic of this new material?
"Yeah, this is amazing. It's quite an invention."
I think to myself as I lightly rub the armrest, thinking I'll have to give my friend a big compliment when he gets back. The comfortable feeling of the armrest makes you want to keep stroking it with your bare skin...

At that moment, the surface of the armrest jumped like a pulse.
And, regardless of my movements, the black sofa wriggled, sinking deeper as if to swallow my body.
"What is it? What is it? !"
The sofa continued to transform in a more dynamic way. The armrests expanded and changed shape, stretching and expanding to cover and envelop my arms, knees and torso, ignoring the original shape completely.
My body was half-buried in the black mass that looked like a sofa, and for a moment I was terrified... but the next sensation that came over me led me to ecstasy.

The black material that enveloped me began to rub and caress each part of my body with a moderate strength, accompanied by a faint vibration, and even crept under my clothes, and the smooth rubbery material, which had a slight warmth from my body and was a moderate coolness, caressed my body.
I felt the fatigue in my whole body being released by the unexpected massage that had suddenly started, and I couldn't help letting out a cry of pleasure.

However, when I realized that the black rubbery material had even gotten inside my underwear and was about to start servicing my penis, which had started to heat up and become hard, I panicked and struggled.
"No, not there! The massage is over now!"
When I moved my limbs around, I realized that it wasn't fixed in place, and that I could feel the black rubber stretching and stretching, but I still couldn't get it off. I stretched the rubber and poked and prodded it with my fingers, looking for some kind of switch.

Then, once again, it deformed, and the seat rose up like a pillar between my legs... I was so stunned that I forgot to resist it, and I gaped open-mouthed at the thing that had been deformed and completed.

The tip was puffed up like a mushroom, and there was a hole in the middle. It was as thick as my thigh, and it stretched high in front of me, and it was definitely the penis of a living thing.

For a moment, the black rubbery penis quivered, and then with a loud gurgling sound, black mucus spurted out of the hole and hit the ceiling.
What is this? I was too stunned to think straight, and all I could do was watch in amazement as the goo went about its business.
The black goo didn't hang down from the ceiling, but instead stuck to the ceiling and moved by itself, gathering in the center and hardening like a black rubber ball. Finally, it fell to the floor and rolled to the foot of the sofa, where it dissolved and merged with the black rubbery substance.

And so I finally noticed that the sofa had already stopped moving. The rubbery material that had been trying to envelop my body was now slipping out without any resistance.
"N-n-nn...."
The black substance flows and undulates like a liquid. The bottom of the sofa swirls and becomes two thick pillars, and from the tips of each one on the floor, five round fingers sprout, creating the shape of a foot.
The seat, with its wide hips and chubby belly, has a penis that is still growing, and it fits into the crotch as it is, and hangs down like a third thigh. 
The armrests and backrest swelled up while twisting, and when they became a round-shaped chest and shoulders, a sphere grew out of them, and the details of a human head were completed.

The shape of the black rubber sofa had completely disappeared, and instead, what was standing there was the familiar silhouette of a friend, but in reality, it was a completely different figure made entirely of black rubber. 
The face, made of shiny black rubber, became a familiar smile as it shimmered, and he said in a voice that was familiar with a slight squeak of rubber.

"Umm, I'm sorry. I didn't think I'd feel so good when you sat on me."
"A... aaa, so you mean..."
I didn't know what to say, so I called out my friend's name, and the black rubbery existence that was my friend's shape looked surprised to be asked something unexpected.
"Of course!  Oh, by any chance, is my shape different from usual...?
, he put his hand on his chin and twisted his body lightly in a fluid-like motion that gave the impression of a different mechanism from that of a human being, looking down at his well-developed body.

His arms and legs, which are thick and swollen with fat due to a lack of exercise, and his flabby chest and belly, which are made of a black rubber-like material, give the impression of being slightly firm, and the smooth surface, which is now hairless, has a sheen to it.
The round, child-like face is that of a familiar friend, but the impression is changed by the black, shiny skin, and the fine wrinkles and stubble are gone, making him look rejuvenated.
His hair, which was a mixture of gray and shaggy, grew from his head in thick tufts like rubber, and it looked like the hair of a figure from a manga or anime.
The thick penis swinging between his thighs had become a slightly more modest size, but it was still much larger than a normal human's.

It looks like my friend. It's roughly the right shape. But...
"That's not the point!"
I exclaimed. It was an unusual existence, but the small quirks, the way it spoke, the expressions on its face were definitely those of my friend, and I finally came to terms with the fact that this black rubbery thing was my friend.
"I thought you'd gone missing for a while, but why are you... why are you like this, with a rubbery body?!"
My friend shook his head with a look of understanding. He has a habit of jumping to conclusions, thinking that others will immediately understand what he understands.
"Oh, well, I was experimenting with a new material called 'violar', but I made a mistake and ended up becoming violar itself. I thought I was going to die. Hahaha."
My friend, who had become violar, put his hands on his hips and laughed nonchalantly, as if to say that now you understand, and I held my head in my hands.

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My friend had been developing a new substance called Bio-Rubber. 
He was absorbed in research into Bio-Rubber, which has a nervous system inside and can be freely deformed by external signals, etc.
He mixed it with some catalyst while sleep-deprived, and then slipped and splashed it over his own body.

Whether it was a mutation or something else, the bio-rubber began to dissolve and eat away at his friend's clothes and body.
"It didn't hurt, it was actually kind of pleasant, but my dick got really big and I couldn't stop ejaculating. Then the bio-rubber started coming out of my dick. That was really scary."

Although his friend had completely melted, he did not lose consciousness and was said to have become one with the viola rubber.
He desperately tried to move while still in a state like a lump of clay, but at first he could only twitch.
Eventually, he was able to connect to the nerves of the Bio-Rubber and change his shape by concentrating hard, but then, as if the shackles had been removed, his body began to change shape on its own, transforming into whatever came into his head.

I was horrified as I listened to my friend's experience. It must be a feeling that would drive a normal person crazy. When I expressed my concern, my friend replied, "It was really fun and really exciting."

He spent the next few days learning to control himself, becoming a bio-rubber himself, and finally he was able to regain his old shape. And somehow he came back... and immediately set a surprise for me. 
"Are you an idiot?"
"Hahaha."

============================================================================================================

At night, I arrive at my hotel room, dragging my suitcase behind me.
My business trip went well, but I'm exhausted today. I take off my suit and hang it on a hanger, then call out to my friend.
"How was the suitcase?"
"Not very interesting. I think it's better to wrap living things."
The suitcase deforms and takes on the form of my friend, who is still naked and plump, but made of black rubber.
As if it were natural, the suitcase opens up like a window, and my friend takes out my luggage and places it on the desk inside.

Several weeks have passed since then.
My friend's body has not returned to normal, and it is still made of bio-rubber.
He has not said things like "I want to become a superhero by making use of a body that can transform into anything and regenerate quickly even if it is injured!" or "I want to become a supervillain by doing evil things!

My life is still more peaceful than I thought, but there has definitely been a change.

When I returned to my room after taking a shower, my friend was nowhere to be seen, and instead there was a shiny, jet-black rubber mat on top of the bed.
As if it had sensed my presence, a part of the mat rose up, and my friend's smiling face appeared, as if emerging from the water's surface, and then a plump arm appeared next to it, beckoning to me.
Still naked and covered in water droplets, I jump roughly onto the black mat. The rubber mat creaks and groans, and the mat bounces up and down.
As soon as I lie down, several soft hands with sponge-like density appear and gently wipe my wet body.

Since then, my friend has become a tool... or, to put it more accurately, he has become bedding or a chair, and he seems to have become addicted to being ridden on or pressed up against by someone and having his weight put on him.
Whether this was caused by the fact that he had become a bio-rubber, or whether it was a latent sexual tendency that had always been there, I don't know, but his body, which had no sense of pain, could be freely deformed, and which seemed to feel good when touched, seemed to be increasing his desire.
Whether his sense of shame and morality had also faded, when he was in human form in the house, he would always be naked and his penis would be completely exposed.

However, the amount of time he is in human form is getting shorter and shorter, and he is usually turned into a carpet or a chair for work. However, according to him, being turned into a sofa or a bed is the best so far.
And so, today too, he has turned into a bed mat just by following me around, but this is not just for his own convenience.

Right now, my neck and below have been swallowed up by the inside of the mat, and I'm enjoying my friend's comfortable massage with my whole body.
Even if I fall asleep like this, my friend will maintain the ideal sleeping posture and regulate my body temperature while supporting my weight.

The wet, smooth tongue growing inside the mat licks the underside of my erect penis.
I let out a ticklish moan and, as if to return the favor, I stand up on my knees inside the mat and put my weight on it, squeezing the inside of the bed with both hands.
Then, something familiar grows on the surface of the mat and spurts out pleasure.
It can change shape at will, but it seems that this is something that can't be endured.

Yes, in the past few weeks, I too have become a body that can't be satisfied with anything other than my friend's mattress or sofa.