[ @deeperthicket ;; <3 for a starter! ]
Sans had noticed that he has a roommate long before he ever saw the other guy. It'd kind of be hard not to, what with the way the entire apartment has slowly been transforming into someone's personal library. They're stacked just about everywhere, even floor to ceiling in a few places. He's been tripping over their stuff ever since they moved into the third floor. His roommate is lucky Sans doesn't actually need to use his bedroom door or actually traverse the place at all, because it's kind of a nightmare.
The first time he actually sees them it's pretty late at night. Sans had ended up lingering out in the shared kitchen far later than he'd originally really meant to, stuck idling by a big pot of dinner slash breakfast slash lunch slash however long he can stretch it out to last him for. Cooking, frankly, is exhausting, so he doesn't even try to do anything hard, just a half-assed stew he can dump into a bunch of bowls and shove into a corner of the fridge for later. Nice and familiar. Though, he can already tell it's going to turn out a little… funky.
There's ambient magic here to consolidate, sure, but it still doesn't feel quite right— or quite as willing to cooperate. Those hotdogs from earlier definitely had a bit of a zing, even if it wasn't all that bad. The short stool he'd left under the sink the first day he actually moved in makes an ugly creaking noise as he kicks it into place beside the stove, stepping up to scrape a board full of messily-chopped carrots in. The magic is congealing a little weird, but nothing explodes, so.
There's the telltale rattle of the front doorknob twisting open, loud in the otherwise relative silence of the apartment. It's just enough to make him pause for a moment, cutting board and knife still in hand.
It doesn't take very long for his mystery roommate to come around the corner of the kitchen— the sound of the pot roiling on the burner is loud enough even without Sans puttering around and ripping into plastic packs of mushrooms. The guy looks like a gentle breeze could knock him over, all gaunt and thin. Could be sort of elegant, if you like your humans freeze-dried. Maybe someone pressed him in a book and left him there for a few decades.
"hey, human." Thunk, thunk, thunk. The mushrooms are soft and easily give way underneath the knife. They aren't the sort he's used to using, but it's probably close enough.
Maybe he should've put his coat and mittens back on, come to think of it.
"you're the books guy, huh? knew i was bound to see you eventually."