Protector - MLP FiM Anime

Author's note: Applejack is already a guy from the start while Rainbow Dash became a guy in my story
Fluttershy, a shy, fragile and kind girl. Rainbow Dash, an athletic, brave and loyal boy.
What will happen if these two became a couple?
Will they forever be happy? Or is it a sad ending?

PS. I kinda made my own version sooo yeah, it doesn't follow the episodes of MLP