UnderFell sans X ReaderLemon

I hope ya likey WARNING LEEEEMOOOOOON I CAN'T STRESS ENOUGH!

Lost {Underfell!Sans X Abused!Reader}

You were being abused. You couldn't take it anymore. But you also couldn't leave your kitten, Millie. So you gently put her in your backpack and got going. Your father wasn't looking. He was drunk, anyways. He probably didn't even notice the window in your room being opened. You made sure to lock your door before you...