The Water Girl (Yuno x reader x Asta)

There are Four Elemental Spirits, the Salamander implying fire, Slyph signifying wind, Undine denoting water, and Gnome meaning earth. Each one is rewarded to the best mages of the elements.
Y/n didn't make the cut to earn one of these extraordinary beings. Instead, obtaining an ancient creature, one who lived as a castaway. It endured hundreds of years of isolation, but with this torture, it was compensated with a prominent quantity of magical power, even being capable of surpassing some of the spirits, but it remained forever encased.
Y/n, a girl who was given to the church a month after Asta and Yuno were. She grew up with the two, understanding and caring for them alongside Sister Lily. Though, she created a strong bond with Asta as a child, becoming best friends with him as they matured. She's always competed with the two, though they never had similar ideals. Y/n's dream is to become the First Squad's Captain, to shield Asta or Yuno if either one becomes the Wizard King.
The ancient animal was distinguished well in Greek Mythology, with the depiction of the sea. Ever since the incarnation of the individual began, the eternal life of inactiveness and sluggishness occurred. She possessed this supreme spirit in the grimoire bestowed to her.
Will she befall beneath the immense power and pressure bequeathed to her? Or craving the love for her childhood friends swipe under her feet before the corruption can?

(I do not own Black Clover or any of the pictures in the story, I simply feature them. And if I do, I'll announce it. Enjoy.)