In the future, who cares when, a scientist has created an Artificial Intelligence hardware (or is it software at the same time) which can physically embed itself into any article of slime. Whether it was a jelly of some sort or even a toy slime, the scientist could install this AI into a slime by injecting or pouring said chemical onto/into a body of slime.
This chemical, whatever it was called, we'll just call it Sentient Slime Water, or SSW, was embedded with a number of (I guess a lot) of nanorobots, each of which were dependent on a central nanorobot to control the other nanobots.
But the central nanobot was controlled by an external remote control or device. Depending on whatever commands were sent to the central nanobot, said slime with SSW in it could begin moving around of it's own accord, become thin, thick, hard, soft, warm, cold, hot, or even act like a sentient being.
Whatever the nanorobots were able to do, the slime would follow.
Now the real story begins when this scientist, who was actually trying to fulfill this strange fetish of his, was for the first time ever, trying out his SSW, which was not necessarily SSW (sentient) yet.
"At last, after ten days in the making I have done it!" said the scientist to himself, quite excited to try out what he believed would be the first successful form of SSW.
In the safety of his bedroom, he extracted the SSW from a flask, and injected it into a nearby container of black toy slime.
Bringing the slime container to his computer, he sat down in a chair to see if the computer's SSW central program could detect the new SSW he had just installed into the slime.
The familiar Windows 7 blue loading circle thing came up, and a few seconds later, the SSW interface opened up a new pop-up window, saying
"Installation of SSW 0.6 confirmed."
He clicked the okay button and navigated to the list of physical options which he could make the slime do.
There were only two in this point of the SSW development.
Fleshlight, Temperature
Anxiously, he clicked to set the Fleshlight setting to on.
The computer displayed the hourglass symbol, and after a few more seconds of waiting, the scientist noticed out of the corner of his eye the slime began to move into the shape of a column, a Fleshlight.
However the amount of slime that was already in the container was not enough to be created into the full size of a normal one, but the scientist was quite happy now nonetheless.
To test it, he tried to pinch off a piece of the column, but rather than just becoming deformed like it normally would without SSW, the slime just bent, like a moist, and yet slightly malleable plastic, almost a Fleshlight. The scientist had done it, but obviously he wasn't finished just yet.
He pulled the fleshlight out from the container, and thought
"This is exactly the right size."
While still having a grip of the thing, as moist as it felt, he peered inside through the lips of the slime fleshlight, but did not see the hole that is in a real one.
"Huh," he said to himself "I thought there was supposed to be a small hole there."
Regardless, he now found himself to be quite hard and eager to test out his newest creation.
Putting it down on his bed, he stripped down naked and returned to the computer chair.
With great care he took the slime fleshlight and lowered it down onto his penis.
Beginning with the head, the slime took it in quite smoothly, only smooshing it softly, before quickly re-assimilating itself around the head, it took the complete shape of it, hugging the head from all sides tightly.
The shaft was also firmly restrained by the slime, feeling like a chilled, wet cloth was squeezing it.
The weight of it was not so overbearing such that the scientist was able to let go of it and it remained standing with the penis, fastened quite hard onto it. He could even notice that the fleshlight was throbbing alongside with his penis.
With his right hand still on it now, he moved his left hand over to mess around with the temperature settings.
Current temperature: 0 - <++> <+> <-> <->
(Double plus = max warmth, double minus = max cold)
He clicked a few times on the plus button and noticed the slime becoming warmer.
Whilst slowly jacking himself off, he began to increase the temperature until the slime felt like a hot tub, without all the bubbles.
His penis was becoming hotter and harder to these new unique sensations.
His penis was having sex with a ... slime.
A pretty hot feeling one.
The slime was continuously tugging his foreskin up and down every time he pumped it.