So I was re-reading the story, and I noticed that I did something I forgot at the start. I had made Frisk's Soul blue. I had originally been planning to do something else with this story, so I'm sorry for the confusion if anyone was confused about that. Enjoy!
-Sans' POV-
the kid was taking a long time. maybe i should check on them. frisk should be near the snowball game. i took a shortcut there and appeared somewhere near the place where i thought they'd be. and there they were. but something was wrong. they were lying curled up on the ground, crying. had something happened?
i walked up to the kid. "hey, kid are you ok?" they turned toward me and i could see the anguished expression of their face.
"I'm sorry Sans, I'm so, so sorry…" what were they talking about? we had established that it wasn't them during the genocide run… right?
"kid, what are you talkin' about? we've established that it wasn't you during the genocide run" my eyes went dark. "or was it?" the kid started crying again. oh man, i made them cry again.
i sat down in the snow beside them. "kid, can you tell me what's wrong? something must be very wrong if you've lost your demeanour." it felt a little weird to be comforting them after all that had happened, but they'd changed, right?
Frisk sat up and looked at me with bleary eyes. they looked a bit done with this, but the predominant expression on their face was apology and sadness.
"S-sans… I'm sorry…" they burst into tears again. "I'm so, so sorry…" i was still confused.
"what are you sorry about? tell me, it's ok." i am not good at this comforting thing. but it seemed to work.
"They… Chara told me that it was me who did the Genocide Run… I didn't believe them, but now…" they looked me right in the eyes. "I remember, Sans. I remember what I did. It was me, Sans, not someone else." they braced themselves for my judgement.
but i was still stuck on the thought that… it was them? but, they're so sweet, i-i don't believe this… but, the look on their face says it all. i had to decide. would i forgive them for the hundreds of genocide runs, or would i condemn this poor kid to a life of misery and sorrow? they seemed to be sorry, but were they just a good actor? i-i don't know…
i made up my mind. "kid, as long as you're sorry and won't do that ever again, then… i forgive you." they visibly relaxed when they heard those last three words. they had probably expected me to not forgive them.
Frisk threw their arms around me. "Sans… thank you. I'm sorry, I'm so, so sorry… but thank you…" i hugged them back.
"it's ok, kid."
If it seems that Sans is forgiving Frisk way too quick, it's just that there have been so many Genocide Runs that he will take anything he gets. He's still a bit skeptical, but he's forgiven them. Thanks for reading!