The strongest person in the original world is found by an unknown System and made its Host. His ice powers are so masterful that they seem divine.
"Why does your ice freeze my flames?" Natsu asks.
"Because you're too weak."
"I'm supposed to be the strongest ice empress, but you always make my heart race. I can't fight you properly." Esdeath says.
"So you're blaming me?"
He has an incredibly doting younger sister, and from then on he goes further and further down the road of being a siscon.
"Big brother, I want that egg of the Ice Crystal Phoenix. Could you go steal it for me?"
"No."
"Am I really your biological sister?"
"You're not my biological sister. I saw Zi bring you home that day."
"Then that's wonderful! I've always loved you, big brother. Let's get married."
"No, let's talk about how to steal the egg instead." Revised...
This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.