It wasn't long before Frisk saw the doors of MTT resort. He was about to walk on in when he spotted a figure out the corner of his eyes. After doing a double take, he recognized Sans leaning against the building.
"Sans? What are you doing here?" Frisk asked the skeleton curiously.
"I heard you're going to the Core. Mind quickly having a chat first?" Frisk shrugged before responding.
"I mean…yeah I have time I guess." Sans led Frisk down a small alley to the left and once more leaned against the wall.
"So…your journey's almost over, huh? You must really wanna go home." Frisk shrugged.
"I mean…I guess so, yeah…"
"Hey, I know the feeling buddo. Though…maybe sometimes it's better to take what's given to you." Frisk frowned slightly.
"What do you mean?"
"Well, down here you've already got food, drink, a friend in Papyrus and myself…is what you have to do…really worth it?"
"What do you mean?"
Sans looked away for a moment, completely silent. When he looked back, he had shut his eyesockets. He opened them a moment later.
"Ah, forget it. I'm rootin for ya kid." There was an uncomfortable silence that passed a few moments longer than both of them would have liked.
"Hey…" Sans continued. "Let me tell you a story. So I'm a sentry in Snowdin Forest, right? I sit out there, and watch for humans. It's kinda boring. Fortunately, deep in the forest, there's this HUGE locked door. It's perfect for practicing knock knock jokes. So one day, I'm hitting them out like usual. I knock on the door and say 'knock knock.' But suddenly, from the other side, I hear a woman's voice. She asked 'Who's there?' So, naturally, I respond. 'dishes.' 'dishes who?' 'dishes a very bad joke." Frisk chuckled. Despite the context of the joke, it was a pretty good one. Inside him though, Frisk wondered. Could it have been…
"Then she just howls with laughter like it's the best joke she's heard in a hundred years. So I keep 'em coming, and she keeps laughing. She's the best audience I've ever had. Then after a dozen of these, SHE throws a joke. It was a good one. We kept joking around for hours." Frisk felt his heart sinking lower. By now he knew exactly who Sans was talking about.
"Eventually, I had to leave. Papyrus can get cranky without his bedtime story. But, she told me to come by again, and so I did. I kept coming back, again, and again. It's a thing now. Telling bad jokes through the door. It rules." Once again, Sans looked away. Frisk found it difficult to meet his eyes when he turned back to him.
"One day though, I noticed she wasn't laughing very much. I asked her what was up. Then she said something strange. 'If a human ever comes through this door…could you please, please promise me something? Watch over them, and protect them. Will you?' Now, I hate making promises. And this woman, I didn't even know her name. But…someone who has a love for bad jokes, and who's got an amazing integrity…" Sans forced himself to look at the ground for a few seconds before looking back to Frisk.
"Do you get what I'm saying?"
"Yeah…I think so…" Frisk sighed, praying that Sans didn't know what Frisk had done.
"…Do you know what would have happened if I hadn't made that promise to her?" Sans once more looked away. When he turned back, Frisk felt his blood run cold. The two tiny dots that acted as Sans's pupils were gone and he uttered a chilling sentence.
"You'd be dead where you stand." Sans blinked, and the dots returned.
"Hey, lighten up bucko. I'm just joking with you. Well, that's all…take care of yourself, kid." Sans then walked away. Frisk watched him with a shiver running down his spine. Sans told Frisk he was joking…but deep down both Frisk and Sand knew, that he had never been more serious in his life.