Sans should have thought about the merits of inviting Alastor over before Papyrus called that morning. A morning ritual they indulged in ever since Sans officially left the nest, despite being the mother hen. Something Sans hadn't considered when he woke up from Alastor moving about. An automatic arch of his back into a cross-legged sitting position, staring beady-eyed toward the radio demon. Alastor laughed, the marker from last night still clutched between his talon-like fingers.
The rest of the night had gone very well. When the sun finally dipped behind the tree-infested horizon, the two men scurried back inside in favor of sleeping indoors. Alastor to the couch and Sans to the floor on the far wall, in favor of keeping an eye on his newfound bestie. If he coincidentally happened to have a marker in his pocket from the arts and crafts shop, and just so happened to have a very empty face a few meters away on his couch, who could blame Sans? Certainly not Alastor, who had crept toward Sans' blanket mound in the midst of shrouded darkness. Marker in hand.
A fool, the both of them. Neither had received any additional art to their faces, and neither had slept too well as a result. As if they both mutually agreed, on their first sleepover, that it was war.
Not that Sans would have slept well regardless. Officially becoming best friends with a demon wasn't something he'd get used to right off the bat.
Sans spent his time that morning—after snatching away that marker from Alastor—getting changed before he tossed on the phone for his brother and busied himself with a lazy breakfast toss-up in the kitchen. Papyrus was going on about a very nice dinner he had with Grillby's parents when Alastor walked in, changed into a spare set of clothes meant for Papyrus. The shirt barely was long enough, leaving a hint of his belly button buried beneath corpse-tinted fur. Hooves clattered against the tiled floor, with an almost shine or glisten to them. The demon already looked put together, despite the lazy outfit Sans had scrounged up for him. Red eyes filtered to the coffee machine; interest peaked.
"Good morning, Comic Sans!" Alastor's voice rang with the familiar tone of an early riser.
Whatever sentence Papyrus was saying was cut dead flat by the sound of Alastor's voice, and shit, Sans was on speaker. Sans hadn't even thought about it. Just autopiloted.
"Who's that? Sans, do you have someone in your house?" Papyrus squeaked. Sans only managed to catch sight of the twitch of Alastor's ears before Alastor laid claim to his phone with swiping hands.
Alastor, the tall fuck, held up Sans' Papyrus-filled phone while he dealt with the phone owner in question, a hand firmly planted against his face to keep the skeleton from stealing back his device. "You must be the lovely brother Sans talks so much about! Sorry for interrupting your phone call with your brother, but I just woke up. We were having a sleepover, you see. I'm Alastor. I'm sure Sans has mentioned me.
"Alastor, dude, buddy, bestie, bro, diddly darn friend—" Sans' hands flailed to grab the phone, but his detrimental height did nothing to alleviate his comfort. Alastor firmly kept his posture and arm narrow and tall as he watched Sans with a grin, no doubt finding it all very amusing. "Give it, Alastor, dude, give it back—"
A very loud and excited squeal came from the phone, causing it to jitter about in Alastor's grasp. Sans' arms drooped as he silently cursed. Too late. Papyrus knew. Fuck.
"He has! I've heard a lot of interesting things about you!" This was the end. Sans needed to go bury himself in a hole. Return to his people.
Alastor looked all too pleased with himself, as if he struck gold. Eyes homed in on Sans, a seeking missile of smugness.
"That's good! I've heard so much about you as well. Sans talks about you all of the time. By the way, congratulations on the wedding!" Alastor sang, and used his free hand to wave at Sans. Sans narrowed his eye sockets and kicked at his shin, which Alastor easily sidestepped. "The first thing Sans did after congratulating you was run to call and tell me! I just had to make sure I could congratulate you as well."

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Ace in a Hole (Undertale x Hazbin Hotel)
FanfictionDue to tight housing conditions on the surface, Sans accepts a desperate, last minute offer to shack up inside of this old radio station in the mountains temporarily. It's a bit of an awkward fit, but it's a roof and Sans isn't going to couch surf w...