Sans feels something snap when the human kills papyrus. The story continues from there. sorry it's such a short description.

Sean and Mark are best buddies. on YouTube and real life. they both discover their inner demons, just they are the demons. whenever they get mad, something bad happens.

this has a little to do with yandere simulator. not much. Mark is obsessed with Sean. he will kill to be with him

jack and Mark turn into anti and dark and don't turn back.

This is a yandere sans x reader. there will be some lemon. I mean, honestly! There are tons of these', and none of them are actual smut. Ok, time for background info. You are a human that fell into the Underground. You have lived with goat mom for 5 years, making you 15 years old. You asked Toriel if you could leave, and she allowed. now you meet Sans, and that is where this story begins. I don't own characters. this is set in classic undertale. Smut, gore. got it? good. Might be slow updates.

In this book, I need suggestions. it is an only dare book, so I need some dares. you can dare all the undertale characters, from all AU's. If you ask for them, they Will be in the chapter. if not, they won't be. only, like 5 dares per chapter at the max. if you would like to remain anonymous for the dare, just say so. I respect your privacy. if you don't say that you want it anonymous, I'll include your name. btw, I'm Sam in the story. so if you have questions, I will reply. just call me Sam if you want me to do something. enjoy!