The dragon of dreams (highschool dxd x great red male reader)

You are the dragon god created by dreams, great red! The most powerful being in the entire world! After many years of doing anything you've ever desired. You finally had nothing else to do to actually amuse you at all, till a grumpy infinity dragon you barged into the home of gave you the idea of getting yourself involved into the problems of the super natural

What will happen when this all powerful being finally decides to join in on the problems of devils, angles, fallen Angel more? Read to find out.