you just came from a random portal that took you out of your warm home and into... UNDERTALE!? it was a bit of a surprise for sure but you just shrugged it off quickly and found out you were just behind the door out of the ruins... oh well! At least get to skip a tu-toriel! you were walking along the snowy path when you were expecting Sans, to break the stick that you walked past, you didnt hear anything, strange... you then walked to the small bridge with the wide and open wooden bars, you realized that... they were actually properly placed in a way to keep people out!? So many surprises, so less answers... maybe its an AU? You then looked past the bars and see Sans in his sentry post stand resting his skull on his arms as papyrus was in front of him, lecturing him on how he should at least be a little more active, you then notice another skeletal figure wearing a black winter jacket, wearing his with his hood up, with sharp teeth, looking at the two brothers silently, Papyrus turned to Maso and then spoke in a thankful voice

Papyrus: Maso! I also have to thank you again for giving me the idea to block the bridge more "properly" as you say.

Maso was quiet for a few seconds before pulling the hood down, the overly fluffy fur on his hoodie covering the rest of his skull from embarrassment

Maso: ... u-uh, you don't have to thank me...

... last time you looked at the Undertale game, there was no third skeleton, well, if mystery man/gaster counts then four, but whatever!