A/N Sorry, I know it has nothing to do with the story, but I felt like it.
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"Hey, Sans, can Frisk come exploring with us?" You ask. "Sure (Y/N), where is she?" Sans asks you. You gesture to Frisk, and she walks over to you. "Hello Sans." She signs, then waves to Sans. "Hey kiddo, you want to go exploring?" He says. Frisk nods, and he walks over to you, holding a small box. "Here, something from Papyrus." He glances to Papyrus, grabbing a cookie from the container. You open the yellow, and red box, with a (f/c) ribbon, and you see a bracelet with your name and half a heart that says 'I love you' but on your side, it only has 'I lo yo' "Thanks Pap!" You yell into the kitchen. "THANKS FOR WHAT, HUMAN?" Papyrus asks you. "The bracelet." You say, looking confused. "Saaaans!!" You say, turning around to look at the skeleton. "Yeah?" He says. 'Ha he knows he got caught!'you think to yourself. "This bracelet isn't from Papyrus, is it?" You say, smugly. "Nooo.'' Sans says, starting to blush a light blue. "Let's go to Waterfall for a few hours (Y/N). I wanna talk to you." You nod, grab your phone and you text Toriel.
(Y/N): Hey mom how r u?
Toriel: I'm fine you?
(Y/N): Same, I'm going to Waterfall with Sans.
Toriel: Good, good. Make sure to visit sometime, okay?
(Y/N): Okay, bye
Toriel: Be back before dark
     *timeskip brought by MTT brand schtuff and yes I meant to spell it like that*

"Are we here yet? It's been forever!" you whine. "Yes, we're here." Sans replies. You sigh with relief, as you sit down. "Sans, what did you want to talk to me about?" you ask. He gets a light blue blush on his cheekbones. "So uh, (Y/N) do you like the bracelet?" he asks you. You nod, and start playing with it. "Well, uh, what I wanted to talk to you about, was uh, I might of kinda planned a surprise. And Pap, Frisk, Tori and Undyne, you'll meet her later, helped me. Will you go to Grillby's with me?" Sans asks you. You look suspicious for a moment, and then you nod. "What's with the bracelet?" he asks, you glance at your wrist, and see it start to glow. "I don't know, and it worries me." you reply. You groan in pain,  Sans starts to freak out, and you feel something on your back. You feel your back and you feel feathers. "(Y-Y/N), y-you have wings. Why?" Sans asks, you shrug, and freak out a small bit. You stretch your wings, and you feel something behind you. "Well, what do we have here? Sans and a....human?" A tough voice says. Before turning around, you quickly analyze the situation. 'Okay, so what could possibly be behind me? A monster, maybe Undyne. I mean we ARE in Waterfall'  you think. "Oh hey, Undyne. 'Sup. This is (Y/N)." Sans says. You turn around to see a blue fish woman with reddish hair behind you, with an evil scowl. "Hi, Undyne. Nice 'ta meet cha." you say, holding out your hand. "Uh-huh. Cool. I'm gonna capture you, take you to the king, he'll take your soul, and we'll be free." Undyne says, pulling out a spear. Sans started to stand up, and he walked next to you. "If I'm gonna go with you, can I go get my phone charger, and say 'bye' to my friends?" you ask her. She growls. "Fine. But I'm going with you punk." She says, putting her spear away. You try to fly, succeed, and fly out of Waterfall.