This story is based off Sonic Unleashed and an idea that SonicAnon gave me.
Sonic and Shadow have been dating and have been trying to have a baby for a while. So when the world starts breaking apart and Dark Gaia is rising from the depths of the earth, Sonic finally gets pregnant with triplets. Bad idea. The Light Gaia, Chip, who has lost all his memory, joins Sonic and Shadow in saving the planet, but with Sonic's due date approaching quickly, Shadow starts being overprotective of Sonic and the unborn triplets, and could cost them the world.
This is the story of the Choas Emeralds creators children. They're unique and used to live in Sonic's world, but decided to live most of their life in the 21st century but now they're back in Sonic's world and they're powers are strong. However they have no idea why they have them. Shadow finds them and decides that he wants to be around them. Why? He has no idea but he does. Find out how these creatures met Sonic and find out what they're powers are for.