Midgard had enchants that lured Thor there no matter how hard his Father had tried to convince him to remain in Asgard. One of those charms answered by the name of Erika, the red, and Thor had loved her at the first sight.
She was brave, lively, strong and, the more time Thor spent by her side, the less he cared about Asgard, his Father or their throne. Living among humans, with a human, like a human, was what taught Thor to be a God.
But loving humans and Earth would only bring Thor pain and suffering.
Odin knew of it and, along with Loki, ignited the war between the dark elves and the dwarves, threatening the existence of the worlds, compelling the gods of Asgard to intervene, including a reluctant Thor.
Thor had to leave Erika's side, but he vowed to return, and he did. Only she wasn't there when he was back.
He had been informed by the Villagers that she had lived a long live and died while still waiting for him. After all, time was different between asgardians and midgardians: some weeks for Thor in Svartalfheim were like 40 years on Earth for her.
Thor had known heartbreak before.
Death had already taken someone important from him, but never this close or this fast. He wondered what he had done to anger the Norns this time.
While praying, he wished that Erika had found her way in the Halls of Valhalla where she would feast and wait for him.
He had also told the villagers not to worry about, for Thor would always come to their aid and they would always be dear to him.
It was when they brought another subject, the boy: Erika had a child, a boy named Modi and they were certain he was Thor's. Could it be?
Thor's heart twisted in his chest when he asked them to bring the boy in, their leader getting inside their hut to pull a small toddler by his hand where Thor was waiting, teary and uneasy.
"Hello, Modi," Thor crouched down to talk to the small boy who was hid behind the leader's legs, seemingly afraid, "how are you doing?"