Your POV
You are hiking up a mountain on a beautiful summer day. Sure is a nice day to go hiking, you thought. You always heard rumors of this mountain hearing things like people go missing and don't come back, or that it's cursed. But you never had any problems with hiking and camping out there. You decide to go further than you usually do because you want to see if you can find something that nobody else has. Eventually you pass signs that say don't climb higher than this point but you keep climbing anyway. Eventually you reach a cave so you pull out your flashlight from your backpack. Your LED light shines bright and you can see a lot clearer now. What is this, you question as you now see a big hole in the cave. You shine your light down there to see if you can see anything, but all you see is darkness. All of a sudden you feel something shove you. "FUUUUUUUUUCK!" you yell as you are falling down into the hole. Your surprise is short lived however as you lose consciousness when you hit the bottom of the pit.
A couple hours later
You slowly open your eyes and notice you are on a big, thick patch of golden flowers. Convenient flowers are convenient you think to yourself before getting up and looking around. You see that your flashlight is broken and that all of your stuff is gone. "Goddammit" you say to yourself. "Hey there," you hear a high pitched voice call out. You look around and see a flower with a face on it. "Howdy," it says, "I'm Flowey the flower". "Did I hit my head too hard during that fall?", you say partially to yourself and to the flower. "No friend, I'm as real as it gets," said Flowey giving a big friendly smile. "Ok then. Do you know how to get out of here?", you ask. "Yeah actually I do. Just step into these white friendly pellets and you will teleport out of here.", says Flowey as a white pellet emerges from thin air. You jump up to catch it and all of a sudden you feel a sharp pain in your hands. "OW! WHAT THE FUCK!", you shout at the flower who now has a demonic face on it and is laughing. "You idiot.", it says, "Don't you know it's kill or be killed down here". "Now how was I supposed to know that.", you tell Flowey. "Too bad. NOW DIE!", Flowey says, then laughing demonically as hundreds of white pellets surround you. Suddenly a fireball shoots out of nowhere and shoots Flowey away. A goat creature then steps forward and says that her name is Toriel. She takes you to her house while telling you how the underground works and explains that you don't have to kill anything if you don't want to. Eventually she hands you some winter clothes saying you're about to go into Snowdin. You give her your thanks and she hands you a phone along with her number. You go through a big door and are now in a snowy forest. You know, how in the hell is there a snowy forest inside of a mountain in the middle of summer? You think to yourself. You are starting to walk in the crunchy snow as you hear a stick crunch from behind you. You look back and nobody is there. You keep walking until you see a bridge. "Heya, don't you know how to greet a new friend. Turn around and shake my hand.", a voice calls from behind you. You slowly turn around and shake a big boned skeleton's hand. FLHHHHHHHP you hear a whoopy cushion along with the skeleton's laughter. "I'm Sans. Sans the skeleton.", he says. You tell him your name and go through the bridge. "You know you're the first human in a while to fall down here. You don't have to worry about me killing or capturing you, but my brother Papyrus really wants to capture a human to impress Undyne, the captain of the Royal Guard. You don't really have to worry about Papyrus though, he's too friendly and probably won't even recognize you.", Sans tells you. "You got a place I can stay? It's pretty cold out here.", you ask. "Yeah kiddo , I got a place in Snowdin.", Sans says as you both continue walking. "So," you say with a smirk "how often do you get snowed in." "Hah! Beat me to it kid!" Sans says excitedly. You then get to a conveniently shaped lamp in a wide open area. "Quick kid my bro is coming. Hide behind that conveniently shaped lamp.", Sans tells you. You do as he says. "SANS, DID YOU FIND A HUMAN? WHY AREN'T AT YOUR POST?", Papyrus demands. "Relax bro. I'm just bone tired, and I'm dying to get home.", Sans says with a huge grin. "SANS! STOP WITH THE PUNS. THE GREAT PAPYRUS CANNOT TAKE ANYMORE.", Papyrus says frustratingly marching off back from where he came from. "Alright kiddo you can come out now. But Papyrus will have puzzles up ahead", Sans says. "What kind?", You ask. "Ah don't worry about it. He literally explains how to do them." "Oh" you reply feeling a lot better about the so called puzzles ahead. Eventually you get to the puzzle Papyrus explains it and you wonder how you are going to get through without getting shocked; then you realize that his footprints are still in the snow. After the rest of the traps, one which involved an unplugged microwave and frozen spaghetti you end up befriending Papyrus because he's not a bad guy you thought. After that you arrive at Snowdin where Sans shows you around town. Nobody seems to know what humans look like so nobody freaks out when they see you. "So it appears you guys have Christmas down here huh.", you point out a tree with decorations and presents under it. "What's Christmas?" Sans asks. "It's a holiday some of us humans have during the winter. But I guess it's only winter down here." You tell him "It all started when a guy named Jesus was born. He never sinned throughout his entire life. Why do you do the decorating of the tree?" You ask. "Well," Sans begins, "it all started when some kids teased another monster by putting decorations on it. And now we put decorations on a tree every year along with presents under it." "Man it's funny," you say "our cultures are so similar in some ways yet so different." You and Sans then get to his house. "Well home sweet home." Sans says as you both walk in. You sit on the couch tired af and begin to doze off.