Intense! I like Toriel's sense of pranking. Too bad Sans seems to be not quite as good a sport in this story as he usually is.

Hee hee. Hey Pap, maybe you should get your own place! No, never mind, what fun would that be?

This is great!

MOAR

Very funny when will part two come out?

next chapter?

this is hilarious. xD
I laugghed so hard :3 Imagine that actually happening

PRANK IDEA! A strange girl that nobody's ever seen before teams up with Sans, and kind of kisses his butt to try and impress him. He thinks it's innocent, and that she's just cute...until she dumps ice water on his head, shouting,
"Do you like doing charity work?!"
Soon, she shows up back at Papyrus' little "base" and gives him a high-five, showing that she's a prank-loving girl who spied on his brother in order to get the perfect practical joke.
(OPTIONAL! Her sister has a /real/ crush on Sans, and joins his side, half to hang out with him, and half to drive her sister completely insane.)

I don't know, why I took so long to review this, but man this was sooo hilarious! I think you wrote the characters perfectly (Even though I kinda feel like, Undyne would side with Papyrus more so than with Sans) and I can't wait see more :)

Ps. Please make more, I need this

This is so funny. I couldn't stop smiling while reading. Keep up the good work!

I have to say, this is really well written. Descriptions of pranks and thoughts going through Sans' head are perfect, and I haven't really spotted any spelling or grammar errors. Well done!

Anyway, on to pranks!

Since I've already came up with a prank on Sans, here's some ideas for pranking other characters:

Papyrus: Paps is about to serve his spaghetti to special guests/at a fancy restaurant, and he complains that he can't finish making so much spaghetti. So the prankers send him a "spaghetti-matic 9001" with a note that says it's a new invention from Alphys, which uses a special mixture of dough that comes with the machine to make spaghetti. It's actually one of those play dough toys, and you can guess what happens when he serves the dish...

Toriel: after a bake sale, someone dresses up as a government official, who claims that people have complained that Toriel's pastries have gotten them ill. He takes her to a 'jail', and Toriel doesn't know what a real jail looks like since she's never been in one. She sighs and sits down on the chair, the one piece of furniture given to her, and a loud fart is heard throughout the cell, and a sensor beneath the whoopie cushion prompts a loud "GEEEEET DUNKED ON!"

Undyne: kinda mean, but...bring her to a seafood restaurant

That's all for now, thanks for using my idea with Sans' hoodie!

hehe sans isn't holding back is he.

ok how about some similarity. Both Papyrus and Sans pack their rib cages with whoopie cushions, and while Toriel and Undyne are over, they give each other a biiiiig hug. to result in the worlds loudest symphony of farts, aaaaand toriel and frisk have to help remove them XD (a brotherly highfive should be awarded here as they both had the same idea/)

Amazing story line! I can't wait for future posts!

This was amazing! Please continue! As for prank ideas, I recommend that Sans and Undyne tape a bunch of lollipops to Papyrus's wall and a sign that says "Prank war is on, but you're gonna have a bad time, suckers!"