Forgotten.
Rain. It was the thing that Undyne had found most calming about the surface. It made her remember when she was a kid, running around and jumping in the puddles in Waterfall... Okay, maybe she also did it as an adult, but it was fun as heck! She wanted to stay there forever. Sitting in the bench in the park across from her apartment, looking up in the sky, eyes closed and letting the droplets fall onto her scales.
But...
Slowly, she opened her eyes and looked forward at the empty and wet playground ahead. Aliza would come here often to play in the swings with... Papyrus...
They had her to thank for reuniting the two. As well as most of the Underground! Undyne was surprised of how easily everyone would be pursued by a little girl like Aliza. They were probably very desperate for some, or any hope at all. But hey, she wasn't complaining. At least they were free. And she had her friends back.
The fish monster felt a sharp pain in the chest, but she couldn't pinpoint why. She had everything and everyone she loved again! Papyrus, Asgore, MK, even Gerson was still here! So why did she feel like there was something missing. Like she had forgotten something or... someone.