DXD: Reincarnated as the descendant of barbatos

[Welcome to your new life!] One day in my life I just slept and woke up in another place, I don't know how I got here, I never saw anyone or asked for anything but I won't waste my new opportunity. [See you in a few decades, enjoy your new childhood!] And that's when my problems started... Note: The main character won't have the level of 'Aha! I'll kill big red in one blow and fuck ophis at the same time' His race is demon and he will remain a demon with the advantages and limitations of a demon, if you don't like the idea anyway I invite you to give the book a chance. Disclaimer: I OWN NEITHER HIGHSCHOOL DXD NOR THE FATE FRANCHISE, CREDITS TO THEIR RESPECTIVE OWNERS. ANY ORIGINAL CHANGES ARE MY INTELLECTUAL PROPERTY