INTRO

LOGIC (yes, in all caps) is a self-insert story. I roleplayed this whole thing in my head too many times to count.
In this story, you are Gaster's 3rd subject; your height is directly in between Pap and Sans' heights. I'm using they/them pronouns, so I don't misgender anyone- I've done it to myself more times than I can count.
Making an actual summary of this story could spoil some parts.