Rimuru the First Demon Lord

In this story, rimuru has died but due to his wishes he went back in time and become a slime? now with his new found powers and skills, he strod off into the unknown and it seems he is not a normal slime but a demon slime? and he is the only SENTIENT BEING IN THIS REALM! Now surrounded by mindless demons, what will this slime do?

I intend only the following ships but I will take opinions:-

Ciel

Blanc

Jaune

Violet

Rimuru due to his strong if not stronger soul changes his gender into a male

Instead of veldora, veldanava will be his 'sworn friend' since there are almost no other sentient beings other than a few

Rimuru will also later evolve into a primordial instead of being one from the beginning. don't ask me how I don't know either

Rimuru and ciel will also be with each other wayyy longer hence they become a bit 'EXTREMELY YANDERE ON EACH OTHER' uhmm a bit obsessive.

also my first time writing a story + haven't read the light novel but kinda know the order and story to an extend + I'm a 6th grader so I don't know a lot of words I can use for my story to express my story BUT I hate spelling mistakes and will probably not make any but a few.
I do not own the tensura series or light novel
it belongs to fuse

also if any one copies my story without my permission I WILL SEND YOU TO JESUS

Taking inspiration is very much allowed