I am searching for stories with Angels and demons involved the vast majority is shit and I've tried looking so help would be apreciated.

 

https://www.fanfiction.net/s/5292171/1/Archangels Maybe, been so long I only vaguely remember it.

https://www.fanfiction.net/s/3473224/1/The-Denarian-Renegade obligatory.

Other than that I am coming up quite short.

 

You really aren't going to get any better than the Denarian series posted above. First instalment is over 300k words long so it should keep you busy.

 

Deal With a Devil (HP/Dresden Files crossover) - https://www.fanfiction.net/s/11188292/1/Deal-with-a-Devil

 

if you squint your eyes a bit Mirand Flairgod's A Second Chance At Life does have something like that at its sequel.

 

If you are interested in demons in a broader sense, then this one might be of interest: https://forums.darklordpotter.net/showthread.php?p=809943#post809943

 

Sorry I forgot to mention I already read the denarian trilogy it got me interested in the whole "demon" thing