A/N: This ones pretty darn short, but I like the idea behind it. I was watching someone do a dub of Undyne and Frisk becoming friends, and suddenly thought, "Why does Undyne just... leave you? Why couldn't she just come along for a while?"
A Warrior's Battle
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"Undyne, wait!"
The fish warrior screeched to a halt mid-stride, She swung around to see the human child standing behind her, looking very small indeed.
"What is it, punk?" Undyne said, flashing a grin. "C'mon, human, why are you looking so down?"
"I..." the human hesitated, twisting their hands together. "I was wondering if you could come with me for a little bit? To help, um, keep the monsters away? I don't think they would bother me if you were around."
Undyne's face fell. She let out a heavy sigh, turning away. How to explain this to a human, and a child at that?
"I... I can't."
"..." The child didn't respond, and Undyne could only imagine the expression their face bore.
"Sometimes... we have to fight, or work our way out of, battles on our own. There's not always going to be someone by your side."
"But... you could be by my side! We could do this together, as friends! Just like you wanted."
"Kid, I said I would be your friend, not that I would fight your battles for you. It's difficult to explain... look, I know you can do this! You managed to get past me, the captain of the royal guard! You didn't even fight me, but you are more of a warrior than most monsters I know. Phhht, those other monsters should be a breeze." Her voice dropped. "Getting past these monsters, it's making you stronger. It may not seem like it at the time, but it's helping make you a better person. If I did all that for you, I'd be taking away your chance to grow."
"I... I know," the child said, their voice wavering, quickly scrubbing a hand over their face. "I just thought..."
Undyne gritted her teeth. She hated seeing her new friend so upset. Ugh, they better not tell anyone about this... "Hey punk."
Undyne knelt down and opened her arms. "C'mere."
The human hesitated for a second, then stepped forward into the hug.
"I know you're scared. Only someone totally stupid wouldn't be. But you gotta keep holding on. You gotta stay determined."