A Flame in the Wind (MHA x Blue Exorcist)

Introduction (not actual story yet)

Uh, hi there. This is my first idea or post I've actually made on Wattpad. So, I like anime. I just recently got into Blue Exorcist when I thought something.

What if Izuku was the Son of Satan instead of Rin? What if Satan wasn't from this world (MHA)? That, complete stranger who happened upon this, is why there are going to be no Exorcists. Don't get mad about it please, because in all honestly, this is taking place in the world of MHA, and there aren't that kind of stuff there.

Anyways, the idea is this: Satan got bored and opened a portal to another world, and met Inko. He possessed a man whose Quirk kept him from getting hurt easily, so Inko never found out about Satan being Satan until she was pregnant. Soon after, the king of demons realized their dimensions were drifting further apart, and the last thing he did before leaving forever was give Inko the sword that would contain all of Izuku's demon powers, so he could live life as a normal kid with a Quirk (the last part didn't work out). So, the story would start off how it did in the anime, but there will, of course, be differences. Like how his demon powers start to show up. If you're wondering, the man Satan possessed has permanent brain damage and internal bleeding, so he has to stay in the hospital for the rest of his life.

So, is this a good Idea? Warning, I write slightly below average when it comes to wording, so criticism would be nice. If anyone likes this idea and wants to write it their own way and do their own thing with it, I'm cool with that. Just tell me your doing it please so I can read it, because I can't find many Blue Exorcist fanfiction crossovers that I really like.

If anyone ever reads this for the Blue Exorcist parts, don't worry, Mephisto and Amaimon will show up. I promise you that.

Should I even write this though? In all honesty I really like the idea and I hope someone out there does too.