Warning: possible swearing, inappropriate humour, perhaps lemons? Idk. Just stop being a goody two shoes and enjoy the book, kid

You're a human that has fallen into Mt. Ebott on the year where all humans dress as monsters...Halloween. So how will the monsters know if you're a human or not?

You and Sans had been friends since you were little, when the monsters had to leave, you were really upset that your only friend, Red as you called him, had to leave. Will he remember you after 7 years of being in the underground? Or will he just forget about you? To find out, read 'An Old Friend' Underfell Sans x Reader.

A fan fiction from a fangirl who needs to go to therapy once and a while ~Darky

Well yea this is an shipping and yes alot of Lemon cause well Underfell Sans is rough ehehe i know in werid well my first time doing this so if i do make a mistake well comment and help me make it better This can be for guys and Girls i really dont care i know you all think it wrong but meh really dont care if you talk trash cause your just mean :p You had finally got enough of your world everyone was rude actually wanted you gone and actually today your parents kicked you out and so you ran away even though you were kicked out to some werid mountain you heard that if you go there you never come back you end up going there and next thing you knew you were falling down (All pics and undertale goes straight to the owner's)

You are an emotopath meaning you can feel emotions and a very strong one at that so felt more than emotions. Your parents were horrible to you and the students at school were no better. At the beginning and end of every day you would go to the tree, 'your' tree. Sitting in it not knowing someone else was there, and like the song goes you might end up k-i-s-s-i-n-g.