Are you sure they won't find out?
“Are you sure they won't find out? Maybe this isn't such a good idea-”
“shhhhh! they will if you don't stop taking pappy! wait-”
Treading both snow and spiderwebs into the house, you open the front door to find yourself suddenly blinded by all the lights in the house turning on simultaneously.
“Surprise!”
Standing there, throughout the entire skeleton household, is every monster you've come to know throughout your stay in Snowdin. Standing in the front of the small crowd is Sans and Papyrus, a banner hung from the ceiling proudly stating “Happy Birthday!” clearly in the smaller skeleton’s sloppy handwriting.
You… you don't know what to say. Is it really your birthday?
“What… what is all this?” You think you're tearing up. The why eludes you.
“it's a surprise party!” Sans announces, gloved hands waving about to all the excited and waiting monsters.
“Sans planned the whole thing, kid. He found out Muffet keeps a calendar and he's been marking off the days since you told us when your birthday is.” Papyrus, thankfully, has a lollipop hanging from between his teeth. As long as it's not a cigarette.
“But… you guys really didn't…” You don't know what to say. Did they really do all this for you? All of them? The canine unit, Muffet, Snowdrake, Icecap - everyone?
You can't help it. You fall to your knees, crying, not sure you'll ever deserve such kindness, especially when you can still feel year-old dust beneath your fingernails no matter how hard you wash your hands.