Undertale x Reader x Creepypasta

Going back to the underground

You were sitting on the couch while watching TV with the creepypastas and Sally sitting beside you your phone suddenly rings you go and picked it up "Hello, (Y/n) speaking?" "(Y-Y/n)! Please help us!" Everyone looked at you with worried faces
"o-okay, Alphys, calm down and tell me what's wrong!" "T-there's a human child
f-fell in the underground and s-started killing everyone!!" Your heart sank when you heard the word 'killing' "I-i want you to
u-use your powers to
d-defeat them!" "I'll be there soon! Where are you right now?" "I-i'm hiding somewhere i-in the underground!" "Good, don't let them find you, where's the human going right now?" "T-they're heading to W-waterfalls, please be q-quick!" "Okay, I'll be there soon, bye!" "B-bye!" You hang up the phone and started packing up all your weapon "(Y/n)? Where are you going?" Jeff asked "sorry, guys! I have to go back to Mt. Ebott! I have to save my friends!" You said ready to go "we'll come with you!" Ben said "sorry, to dangerous" you said slamming the door before they could follow you, you teleported in the underground and looked around "TORIEL! TORIEL!?" You screamed "(Y/n)!?" It said you turned around and saw nothing "uh, hi?" "Down here!!" You looked down and a flower "a… talking flower?" You asked as you shook your head "look whoever you are, I'm kind of in a hurry right now, so, yeah, bye!" You said running you suddenly saw vines wrapped around your leg making you trip "AH, SHIT!" You screamed falling to the ground "that's the reason why I'm here, idiot!" He said "what?" You asked as he sighed "my name is Flowey, Flowey the flower! And I'm here to help you!" He said "uh, okay then, Flowey so you know what's happening?" You asked "of course I do! And my real name is Asriel by the way!" He said "ASRIEL!? I-it can't be! He's dead! And the real Asriel wouldn't say 'idiot' to anyone" You said "yeah, but
I'm not a goat right now, right? And if I'm not the real Asriel how could I know your name, (Y/n)?" He said as you gasped "there's no time to explain! You have to stop the human! Don't be scared, I'll follow you!" Flowey said as you nod and ran

                     Later

You saw the human killed Undyne right in front of you after the human left you quickly go to Undyne who was melting "U-undyne, no… please, don't die!" you whispered before she disappeared you suddenly feel a bony hand on your shoulder "(Y/n)…" you turned around and saw Sans "S-sans!?" You said "why are you wearing Papyrus's scarf?" You asked his eyes suddenly went black
"he died" he said darkly you cried and cover your eyes with your hands Sans hugged you, resting his chin on your head "(Y/n) don't worry, we'll stop the human" Sans said as you giggled "okey, it's funny that we're wearing the same clothes" you said while Sans wiped away your tears blushing bright blue, he stand up and offered his hand that you gladly accepted
    
                    Later

The human was fighting Sans while you're just invisible because Sans said 'I want you to stay invisible but if i screamed your name you quickly come here and help me, okay?' You watched as Sans attack the human with his so-called Gaster blaster you looked at the human closely they had red eyes and a smile from ear to ear it reminds you of Chara you looked at Sans who has one glowing eye (P.S. you have San's power but your one glowing eye is red)
Your eyes widen as the human killed Sans his mouth started bleeding
"*cough* (Y-Y/n)!" You stopped being invisible and ran towards Sans "S-Sans! Please, please don't die!" You said even though you already know that he's going to die "(Y-Y/n), I… i need to tell you something before I disappear" Sans said
"Tell me! Tell me anything you want! Please…" you said tears starting to form
"I love you…" he said wiping away your tears "I love you, too" you said holding his hand he blushed and smiled (like he always do)
"r-really?" He asked as you nod "I really do…" you said as he turned into ashes and the wind blow them away