Simons childhood is rough. Very rough. Is mother is... emotionally unavailable, and his father was a drunk who liked to hit Simon when he got angry... or just bored.
Simon. A shy, quiet, introverted kid.
He felt lonely as well. Very lonely. But he felt like he wasn't really alone... he felt watched every time he was alone in his room. He escaped his father's anger so many times just before his father would do something very bad that could've maybe killed him. He thought it was luck. But behind that was so much more.
He saw Shadows in his room. Unnatural shadows, but somehow they didn't seem scary. And at night there was always a crow on the tree in front of his window.
After time, he learned what was behind it. You. Goddess of death.
You started showing yourself to him. Explaining who you are and what your realm is, and what happens after death, but you told him you wanted to protect him and not take him with you.
After time, Simon started to tell you everything. He saw you as his only friend. He trusted you. Knew you would always try your best to protect him.