"Someday, I Swear I'll Make You Mine"

A lonely little boy, a lone wolf girl, he's a guardian, she's a bandit, he's a kid, she's a teen going into adulthood, he is really 700 years old and she is 18, he is the protector to the "Fountain of Youth" and she is seeking the fountain to use for a goal: live long enough and hope to have something good happen in life. That's what Ban thought she'd want to achieve upon laying eyes on the grail, but, life throws in loops, and upon meeting a certain blond, she starts to set her eyes on something else...or rather, someone. -Oneshot- (A genderbent version Of Ban looks like a mix of Archerko and Inner Moka Akashiya as Fem! Heine is similar to that mix as well. This is how Ban and Elaine first meet before Ban became one of the Seven Deadly Sins. Male! Elaine will be called Elain instead and will look like a blonde Kirito from SAO II in the elf arc.)