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This takes place in the early days of the characters present in the game . When Sans, Alphys, Undyne and Grillby were children.
Presenting to you dear reader a day of they're life.
It was a normal day in the Underground, since Gerson ( the old turtle monster that no one is sure how old is) was the only one of the free and Grillby's parents alongside Doctor Gaster were busy at the moment with they're respective jobs.
Rezulted in por old Gerson being the one responsible for the wellbeing of the four monster children, for the day.
Usualy it shouldn't be a problem as usualy Grillby was pretty chill along side Alphys and Sans who kept they're nerd talk or played calm games and with Undyne trying to beat them at said games.
But today was not one of said unsual days. Because the gods, if there are any, decided to give him babysit four extremely active children today.
Thank Toby Fox wherever he is that they were in an not lived area! And holly flip was he happy he chose to go to waterfall today and there was enough water to stop fires!
Apparently Grillby decided to use the tea set that Sans and Alphis brought while undine decided to help him by making biscuits from the cake Grillby brought.
Rezulting in an 2 meter area around Grillby getting burned and some kind of cake crumbs round biscuits stabed in multiple parts by Undines spear because and I quote she said " they neeed to look like they have been trugh war so they can resist a tea's hottnes."
While Sans and Alphis set down a picnic blanket.
That should usually be no problem if they didn't also set down an little table full of scientific stuff such as unknown substances!
Gerson had no idea where they even got those , they didn't carry a table here!
Him having no idea that Sans can and will teleport if he wants to bring something without having to move.
So here they were , Gerson with four children .
Siting on a picnic blanket having crumbing biscuits made from cake waiting for his tea to not be as hot as lava while looking at the four children that were talking animatedly.
And yes it would be a calm activity if it weren't for the child skeleton avarage of 7 years old .
Having somehow goten himself working magic years and tails from and experiment him and Alphys made while Gerson was busy stoping the fire Grillby made from multiplying!
And the children weren't even. Other by Sans new blue magic tail and cat ears, completely ignoring them. In favour of talking about what they could use Grillby's fire magic in a fight of all things !
He is to old for this..
How was he even gonna explane this to Doctor Gaster..
... It's been a few days since that incident.
Doctor Gaster told him it was not his foult as that happened before and the children (Sans and Alphys ) were trying to recreate it .
The two somehow having planed that whole chaos that Grillby and Undine did, specifically to not be stoped from making the experiment..
Long story short sans did not keep the cat ears and the tail. And Undine was baned from using spears while cooking.