Ok, so, For we once so loved the world is not my story. It is a story written by HowlingDarkness95, at this link:
https://www.fanfiction.net/s/9937571/1/For-We-Once-So-Loved-The-World
It is completed, and the author has not had any sequel mentions, so I'm trying my best here because, oh, I just so hate this hanging.
This should be viewed not precisely as a sequel but more of a fanfiction of For we once so loved the world.
So, I'll try my best, and it most probably would not match up to anything like the way HowlingDarkness writes because he (he? I'm not sure) is brilliant, and I'm just trying my best.
There would probably be less of the Avengers (because I don't know much about them, not really...) and more of Percy and Loki and the Greek Pantheon.
Enough talking; let's get to it already.
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Loki's punishment for his betrayal to the Nine Realms was spending a hundred years in each realm, Asgard, Midgard, and Jotunheim, repairing the damage done by the war. While he could have argued, debated, even pleaded for a better judgment, he agreed to this absurd request.
Because he could never forget the boy who was so angry, so tired, so... utterly heartbroken as Percy Jackson had been, and there was no way that he could leave the boy like that.
He was given a choice, which realm did he want to go to first?
There was no hesitation on the God of Mischief's behalf.
"Midgard."
A tale sought to be as old as time. A story told around a campfire as the children eagerly leaned in, hungry for the next plot. The story of young gods that commanded the winds and tides, that wove your fate and destiny; gods that rode into battle on the backs of mighty steads, axe in hand, and shield in the other.
A story of thunder and lightning, and snakes that writhed through tall grass. A story of love.
Asgard and Vanaheim. Two sister realms of the World Tree, Yggdrasil. Both realms raged war for centuries over a long forgotten matter. Thousands killed, cities laid to waste. From this war, Freya and Iwaldi, rulers of Vanaheim, strike a truce with the All-Father Odin in attempt to finally bring everlasting peace through the Nine Realms.
Sigyn, Princess of Vanaheim, and Thor, Son of Odin, are arranged to marry for the sake of their realms. Neither of them want it. Neither of them love each other.
The young God of Mischief, however, brews himself a plan.
But, with all the bad luck in the nine realms, Loki falls for the young Princess. Young love blossoms like a flower from its bud. Both families are against it and try everything in their power to keep them apart. It's not an ideal match. The silver-tongued Prince cannot be trusted to keep everlasting peace.
Whether it be The Norns, nothing can keep them apart in the end.
Until a terrible tragedy bestows them and Loki falls from Asgard.
(Based on Norse Mythology.)