Two Different Sides (Marvel Avengers Pietro X Reader)

They weren't that different besides the fact that they were born and raised on the opposite side.
Y/N, Born and Raised on the South Side of the universe. Daughter of Barry Allen. Speedster. The Pranker. Has one different ability that's not known.
Pietro, Born and Raised on the North Side of the universe. Parents: Dead. Speedster. The Jokester. Twin Brother of Wanda Maximoff.

The universe was cut in half, Superheroes on both sides. Each side doesn't remember anything about the other side. There was the great war (Not WW1 or WW2..) in the universe, Then one day.. There was a mystical being that appeared in the middle of their war, She had a Light Green and Ocean Blue dress that went down to her feet, Her sleeves were rapt around her shoulders. She had fluorescent H/C (Your hair color.) hair. Both sides stopped and looked at the majestic Lady that appeared. She then said, "We can never obtain in the outer world until we make peace with ourselves." The sides grabbed their weapons and were ready to strike, "Peace, which costs nothing, is attended with infinitely more advantage then any victory with all its expense." The sides looked at eachother and at the lady making a type of agreement then charge at the woman, Once they had her close to death, she then said, "If there must be trouble let it be in my day, that my child may have peace." Then with all her power made a force field and died peacefully. And that was 17,0000 Years Ago.

I don't own any of the characters except my own OC's, I don't own Marvel, DC, and I sure don't own you!