The Mistake That Has 2 Lives (Error Sans story)

This is cliché, sorry (the first part at least). Error gets ambushed (by almost the whole multiverse) in a blank AU. He makes a portal and finds himself in one of the newer AUs. He tried something he never did before and it worked. Error was able to hide his strings. He looked the same but without the "tear marks", to add to his... I guess you can say it's a disguise, he put on his glasses. The Sans and Papyrus of that AU escaped from Gaster, and found Error as he was still hurt. They felt safe with Error and he named them Null (Sans) and Void (Papyrus). Error, Null and Void lived in Outertale, hidden, but not far from the cliff where someone can fall into the void is. The 3 of them loved each other, Null nor Void knew he was the destroyer, he didn't want them to panic, Error told them about the balance though. No one knew he has 2 lives, not even his children. (But it's revealed in the 1st chapter)
Null loved the stars and constellations while

The children both loved space, Null loves the constellations and Void the nebulae (plural of nebula). Null knew all the constellations and Void knew all the types of nebulae.

Idea by @LionaGalaxy (I think)
FGoD Error by @harrish6