It's been 2 years since you've broken the barrier and freed the monsters from the underground, and everyone's been enjoying life up on the surface. And as for where you've went, you've been adopted by fluffy goat mom Toriel and living under her roof and care.
Today was like any other day, you were roaming around the house, feeling a bit bored, when you hear Toriel struggling with a spell. "Ah! That's not right at all, the spell should've only made one pie, not dozens!" she exclaims, the clattering of pie tins being set on the counter being heard all the way from the living room. And with nothing else to do right now, you decided to go into the kitchen to see what's up
"Oh my, they're everywhere! There's no more space on the counter, or the floors... Oh dear..."
Toriel muses, standing around and holding a pie in her hands while countless others are stacked around her, wondering what she's going to do about them all... And then that's when she sees you!
"Ah- My child, hello! It seems that I've had a bit of a hiccup with a spell of mine, and well... I've accidentally made so many! What am I to do?"