When the wedding arrived, Alastor showed up to Earth in his brand-new suit. A tad bit vintage, but still stylish and classic enough to not draw too much attention to himself. His morning was spent carefully ironing out the suit, brushing his teeth until they shimmered, and combing his hair to just the right amount of fluffiness. The gift was already carefully wrapped up, tucked into a corner of his radio tower in case any of the other hotel guests dared to snoop. Alastor made sure to lock his room before he got ready in his human form, making sure everything was prim and proper. It'd been a while since he went to a wedding.
Last time had been their neighbor, Miss Kathleen got married to a sweet farmer boy from the South. He had an overbite and receding hairline, but both were sickly in love and gooey romantic with one another. As far as he was aware, neither of them went to hell. When Alastor did linger on it, he found that it quite made sense. They always let Alastor sneak on over and grab some medicine if his Pa was rough that day. Kathleen's husband, short and scrawny, as if built like a scarecrow, even dared to stand up to his Father once or twice. Kind people, those two. That's why he didn't mind attending their wedding, watching them find their bliss from the back.
Of course, now that he was in hell, people simply didn't pass out wedding invitations like candy. Weddings were small or pointless, so Alastor either didn't get invited or didn't attend. No one would really bother to invite the radio demon of all people, not when they savored their lives in hell. Much less bothered to host a wedding at all.
Yet there he was, looking himself up and down in the mirror. Brown suit. Bowtie. Shirt perfectly tucked in. Not a wrinkle in sight. Even if his image wasn't something he consciously watched, he would have fretted over his appearance anyways. Papyrus was Sans's everything. Daring to come looking like a lazy slob would get him tossed on his ass.
When he had everything ready, both himself and the present wrapped exquisitely, he opened up his portal to Sans' location. Sans wasn't at his home, not for that night. Papyrus and Grillby had their chosen best people sleepover that night to help get ready, and while Alastor was invited to that as well, he doubted a sleepover would be a good idea with someone he cared nothing about. Alastor didn't think his and Sans' shenanigans would be tamed by the context of a social sleepover. One of them would have woken up with some type of inappropriate or stupid drawing on their arms or legs.
The wedding was not to be ruined, under any context. The sleepover was other territory.
Alastor arrived on earth in a hallway, one he wasn't familiar with at all. They had agreed upon a time for Sans to get himself alone so Alastor could show up, and the skeleton had chosen a secluded back hallway of the facility where the wedding would take place. Sans himself was wearing a nice suit, with a hint of eyeliner underneath his eye sockets to make them pop and the tips of his fingers neatly filed. His bestie leaned against the wall, on his phone with someone before Alastor strolled in. After hearing the portal open, Sans perked, and began to search his surroundings until he locked onto Alastor. Alastor quickly cascaded out onto the soft, plumped carpet, the present balanced against his chest.
"Sans, what a perfect day for a wedding!" He said, glancing towards the window. Snowing, as expected. Light, feathery snowflakes that fluttered about. Alastor hadn't seen true, cold snow since he was alive. A beauty to behold. "You look rather nice today. It's about time you went from shit to average looks."
"Aw, thanks bud," Sans practically sung back, his voice almost delirious from joy. "You look nice as well. Like an old vintage painting that's been shit on."
"Thank you. That's what I was going for. The classic era where people actually cared."
Sans really did need to wear more suits. Alastor was going to make sure his personal tailors were all on standby when Sans ended up down below. Sure, he'd let the skeleton pick his own wardrobe, but he would have a required few suits or nicer tops thrown into the mix. And a onesie, since that was funny to think about.

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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...