Okay, so this is kinda based on a version of Abyss I roleplay with @Nightstar246 . She can turn into a human thanks to her hybrid heritage, but it takes a lot of magic to do so, so it's not common to see her as a human. Also, Ink is an asshole that harasses her.

Abyss grinned as she flipped again, ignoring Mecha's cheers. The short Sans was enjoying herself with his hobby.... then Ink popped up, catching her off guard and making her fall with a grunt. "INK!" She shouted, getting up and brushing herself off. "What the heck?!" Ink said nothing, just stared at her. "What, do I have dirt on me or somethin'?" Abyss asked in confusion. "He's in shock from the flips." Mecha helpfully supplied, walking over.

Ink shook his head quickly, his eyelights lighting up. "THAT WAS AMAZING!"

Abyss stared silently.

"OUT!" The currently human girl shrieked. How did he even get into the base?!
Mecha helped shoo him out.

Abyss groaned and went back to her normal form, making the leotard not fit as nicely. "Well, that killed it." she mumbled, going to change. "Hey, how did you make that flip?" Mecha asked curiously.

"I'M SHORT!" she shouted back.