In a space that lesser beings could only perceive as darkness, there were several books on podiums and a new one had appeared. In an instant, a dark figure appeared and looked upon the book, instantly perceiving it.

"Gather around all who can hear for a fantastical tale is to be revealed!" the dark figure boomed

As he said that, many dark figures similar to him appeared before one of them said;

"Oh, great one. What is this tale that even you shall call it fantastical?"

"This tale is about a young boy not of that world reborn into one of its many gods. His adventures, his relationships, and much more will be told in this tale. This tale that I shall call "The Book of Loki" is going to be one you love my children and remember, the language of lesser beings is quite different compared to ours, so make sure to listen and translate it properly."

"Oh, look, look it's about to start." one of the younger-looking dark figures said

After they said that, everyone turned their eyes to the book as a small projection began to play as words appeared on the page.

There will be some added concepts or characters from other fiction that will work themselves into the story. There will be a harem, but it's a small one with only three wives. If you're a Norse mythology fan, you'd know two of them.
I'll try to post once a week 
This is posted on Webnovel
(No images are mine)

Norse Character Image(Aesir)