There was something spectacular about the converging of two very different universes. For one, you get to see what you could have been if x thing changed, or if you chose x instead of y. An example of this is if Reds world chose kindness instead of fighting. You get a tale verse.
More specifically, this tale verse that his fell verse had mixed with. How, or why, hasn't been discovered yet, if it even will be discovered.
Classic was sitting on the roof again, staring at the sky like it held all the secrets and answers in the world, each constellation, ones known, and unknown, holding a story, an answer, a question that he desperately searched for. Red eyed the thin blanket around the smaller Sans's shoulders, wondering if he was warm enough up here. The winter season on the surface was much colder than Snowdin, and he didn't want the other getting sick. Not with his low HP.
"sup, starlord." he grumbled, cautiously climbing out of the window, very pointedly not looking at the slope of the roof, and how far down it was if he slipped.
"oh, hey red." Classic distractedly waved a hand, jotting down a note with his other. "what're you doing up so late?"
Red raised a bonebrow, giving him a very pointed glance. "really?" he rolled his eye-lights, "gee, starlord, I wonder why."
Classics face flushed, the rarely seen freckles making an appearance for once, and Red barely held back the urge to trace shapes on them. His soul fluttered with affection for the other.
Red slowly made his way over to the ledge where Classic was perched, the roof on this section of the house leveled out to an incredibly small, mostly flat platform. An old telescope surrounded by marked papers took up nearly the entire space.
Pulling two mugs of hot chocolate out of his [ITEMS] he offered one to Classic. "yeh want one?" Now that he was (mostly) safe from falling, Red relaxed.
"hm? Oh yeah, thanks." the offered mug was immediately set on a few papers behind them. Now that he was in no danger of (getting caught) falling (too late), Red took the time to glance at the "classic" sans. While they may have been similar enough that they had recognized each other the first day they had met, there were a lot of differences between the two. Differences that Red could stare at all day, if he could.
His soul stuttered at how the other looked. A dim light softly lit his face, but it was the falling snow, and how his eyelights where in the subtlest star shapes that was truly the most beautiful sight that Red had ever seen.
"it's gorgeous, isn't it?" classic had suddenly spoken, startling the other.
"wha- oh ye- OH SHIT!" the one sided moment was broken, Red had fallen off of the roof and into the snow below them. Landing on his back, he shook his head and looked up. Classic was peaking past the roof, clear amusement on his face, but the moon lit a halo around him, and Red was starstruck.