A slime’s growth

A first for me, and I hope you follow me through this story. I'm not confident in my writing, because English isn't my first language. So if anything looks odd or you don't understand, please tell me. In later chapters, there might be some gore at some point, but I'm not sure. It may also become confusing in the far future. It's a big project, and luckily, you might want to see more of it after reading the first few chapters. Also, the NSFW part isn't for now. It will be in the future, but I need to show a lot of things still before showing the "plot". And it will be in rare cases, soooo... If you came here for some "scenes", you will have to wait.
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In so many dimensions and worlds, a slime is considered a simple creature that is bound to be weak and will just be canon fodder, or will just be "experience points", as some Otherwolders would say. And in some worlds, those seemingly weak creatures become stronger only when a former human takes possession of one... oooor some person tames one and gives it a possible way to grow quickly, by buffs or perks with taming skills.(I'm sure I'm missing some scenarios, but managing a world is hard, ok? It's logical I cannot see everything.)
But,...
....
...what if that simple creature that everyone kills so quickly, was to live long beyond any before?

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Tags and Genre may change as the story goes on. I'm not good in choosing those. I'm putting a warning in advance.