You and Frisk had gotten monsters to the surface, many monsters thought it was impressive that a ten year old (Frisk) and a six year old (you) could do that. Yet, when Frisk had given up on rescuing Gaster... you found another way. You fused your soul with his so you could bring him along.
Toriel had just let your room, wishing you goodnight, before you sat up and summoned your soul. "Grandunkle Gaster? Are you awake?" You asked as Gaster exited your soul and sat in front of you. "Yes, but you should be asleep." Gaster answered while yawning.
"I just want to know someone... why do Sans and Alphys always give me worried looks?" You asked before Gaster glanced away. "Perhaps... they can see me or know you did something to your soul." Gaster answered before you looked down. "...yeah..." There was a long pause between the two of you.
"Child, you're worried they'll hurt me. Is that true?" Gaster asked as you nodded your head slowly. "Y-Yes... I was able t-to read some of dunkle Sans's files a-and..." Gaster hugged you as you teared up a little. "...get some sleep (y/n)..." Gaster advised.
You slowly closed your eyes before falling asleep as Gaster laid you down and covered you up. He stared to your Mew Mew Kissy Cutie alarm clock before entering your soul. You clutched your pillow as Sans opened your door. You heard Sans leave as you blinked, revealing a pair of blue and orange eyes.
Part 2... maybe? Might turn this idea to a book or an OC?