demon prince (dxd x m!reader)

the devils, angels and fallen angel knew that all demon are instinct cause of the dragon of apocalypse/acnologia and the rebel dragon that ambush them and steal all their lands and richest just to prove that their more superior to them.it happened 500 years befor the great war.

But what if acnologia didn't really succeed killing them all. what if the survivor was the strongest. What if its the king and his family.

ps. acnologia already died cause he was killed after he ambush the demons.And he was killed by his brothers