I'm Sans, but it's Hell to You (UNDERTALE Sans X Reader)

Grillby's

I woke up and yawned rather loudly, not noticing Sans, who was sat on the floor. He turned and waved, "Mornin' by the way, the reason you haven't heard much crashing.... Or if you have... Paps' out right now, training with Undyne... Someone you should wait to meet...." He spoke quietly, and stood up, "Anyways, I'm going to Grillby's for breakfast, you wanna come? I'm sure the place will warm your heart.

Now I know what he mean by that. The owner, Grillby, was MADE of FIRE. Sans had chosen some seats at the bar, making me wonder how old this "sans" and his brother were. He coughed, snapping me out of the trance I was apparently in, and patted the seat next to him, but after he had, I heard the sound of a fart. I knew he had placed a whoopie cushion. "Nice try, Mr. Bones, but uh.... I can see right through you..." I said, smirking at my, apparently good, attempt at a pun. Sans sat there laughing, and pushed the cushion off. "Alright, you caught me! I am no match for you...." He stuck his tongue out, and waved over Grillby. "Fries or a Burger? Or both?" I held up one finger to symbolize thinking as I glanced around at the strange beings that surrounded me, "uh... (B/F) -burger or fries-  I guess?" He ordered a double, and after only a few seconds, Grillby came out with two, fresh, (B/F). I then turned to sans, "hey can you pass that? I need to ketchup with my (B/F)" he chuckled and passed me the ketchup. I looked at it suspiciously, and twisted the cap to the right. "Stop Sans, I've already told you-", "You can see right through me? Maybe you'd, really like to see through me?" He winked and then took the ketchup from me, drenching his (B/F) in it, then handing it back to me. "How can you eat with so much ketchup?" He shrugs, and begins eating, although, it makes me wonder. 'How does that work?' I take the ketchup back, and put some on my meal as well. Sans then speaks, "Eating? It's simple, it goes down me, but rather than into my stomach, it disintegrates into energy...." I realized I spoke out loud, "Oh.... Okay" I spoke back, a light blush creeping up my face. "So.... My offer still stands~" Sans chuckles and nudges my elbow, "uhh.... No thanks, just met ya yesterday remember?" Sans blinked, then nodded, mumbling something almost inaudible, but I caught a few words, "not.... This.... Line" he shook his head, and smiled again, "you done?" I realized I ate my (B/F) quite quickly. I nodded and he stood up. I followed him, standing up, and walking away, back to his house with him.