Angel reader x Au sanses

Prologue

Many years ago when men and monsters roam the earth there was a girl. Not any girl...she was an angel named (Y/N). She had incredible powers that were to give strength to humans and monsters who had worth in such power. She became a legend to all humans and monsters. Everything was fine until the Great War between the two races. During that time both humans and monsters seek her power for their selfish needs against their enemies. (Y/N) was devastated and she soon realized that both monsters and humans were greedy and selfish and they only wanted power to themselves and they didn't have love or kindness in their hearts. So (Y/N) hid herself from the humans and monsters until after the humans won the war and sealed the monsters underground with a magical barrier that can only be passed by a powerful soul. After that day (Y/N) blended herself among the humans so she could be safe from those who seek for power from her. 

Over the centuries (Y/N) still hid herself and everything changed. She soon realized that more worlds that are similar to the one she was in but with different personalities. She traveled through the multiverse without getting caught by anyone letting them know that she was the Legendary Angel. So she decided to find a peaceful Au to settle in and find a host family to hide upon so her secret identity of being the Angel from the Legend from being revealed to anyone. But so far she didn't find any until she found the original Au: Undertale. So she flew into that Au without getting caught and searched for a host family. While she was looking she saw both humans and monsters living together in peace. She was surprised that the both races were once again in peace. But she didn't trust them after what had happened over the last years. So she continued to search for a host family she saw a human child named Frisk that was claimed to have freed the monsters from the underground and she was the monster ambassator. (Y/N) soon realized that she had found her host family. She thought of how she could be a part of Frisk's family until she found a way. If she could blend into a child Frisk age she could hide herself among Frisk's family. She focused her powers and transformed into a child. 

From then on (Y/N) became a part of Frisk's family and she knew that she would be safe and she could be hidden and be a normal human from being a Angel of Legend. Over the years (Y/N) got used to Frisk's family that were monsters because they treated her like family like they do to Frisk. (Y/N) then knew that she could forever live in peace from those who seek her power of strength and she would no longer live in fear of being hunted down. Or will this peace be off balance?