Castle's Pet (Bad Guys X Reader)

[Highest Rank: #1 in "sans"] [Second Highest Rank: #18 in "xreader"]
(Girls only!) (Earlier updates are on my Quotev account!)
WARNING: Profanity and Violence!

You were a normal 17 years old girl from the Undertale universe, you fell down Mt. Ebott when you were 15 and you've lived in the Ruins with Toriel. Oddly enough, you haven't heard anything from (F/N) since you fell. And you knew he planned something.

The Villains needed a new plan against the Star Sanses and some other heroes. What happens if a mysterious cloaked man tells them about about you?