Y/N's best friend Blueberry (also known as Underswap Sans) invited them to move into the shared/connected apartment next door. They could hang out all the time! It's an awesome opportunity and the chances of it happening again are slim. Being closer to friends means a lot, especially in this tough life on the surface. Blue has introduced Y/N to other Sanses before, and they've never had any issues with them. Even so, what happens when they find out that Blueberry now has a very creepy one as a roommate? His cracked-open skull and unclear motives for being here are a major concern. Still, it's not as freaky as the stranger's ghostly appearances and obnoxious actions. Blue says "he's just misunderstood." Should Y/N follow their conscience, warn Blue and run? Or listen to Blueberry's optimistic advice, and befriend their new neighbor? Hello! owo ... Undertale aus and art presented in this book are not mine. However, the story is 100% my work! I hope you enjoy it!

When your sibling Chara goes missing you fear the worst, but life takes a surprising turn for the better when they release the monsters trapped underground. Living this new life in your home AU of Underswap things couldn't be better. That is until a certain skeleton appears and threatens to tear apart your Au. Not wanting to loose Chara again or risk the loss of your new family you fear for the worst and attempt to strike a deal with this new monster. Your soul, in exchange for your entire Au to be spared. But what happens when this monster who steals you away can't take your soul in the end? What happens when he feels these new emotions he's never felt before? Confused and complicated emotions turn this situation into an even stranger one. And the more time seems to pass the more you realize, maybe he isn't so bad after all. But time is running short and it's up to you to find a way back to your Au before the timer runs out and you become like him. But can you do it in the end? (This is an Error X Female reader slow burn, I repeat slow burn. Cover art is my own! Some themes to this may be heavy to some readers so please proceed with caution! If you'd like this more gender neutral please let me know and I'll be happy to fix it! Enjoy!)