Neon Moon—Chapter One
by taitofan
Rated T for sexual situations
Disclaimer: I don't own Undertale or its characters.
Author's Note: Papyton is my otp but I really like the idea of Sans cockblocking the couple and treating Mettaton like crap, only to realize he actually has the hots for him. Thus this fic.
If you have any CC, please share and I'll listen. Please read, review, and enjoy! Finished 10-15-15
If there's one person who deserves a good dunking, Sans thinks, it's that lousy excuse for a robot. The one who thinks he can just waltz in and be everything Papyrus had ever thought he was and more. The same robot who, despite appearances and public persona, has been nothing but sweet and charming and ridiculously chaste to Papyrus since they've started dating.
Sans hates it. Sans hates Mettaton. It doesn't seem to matter how many warnings or dirty looks or outright threats that Sans throws his way—Mettaton keeps coming back to Papyrus. Sans knows—he just knows—that it's only a matter of time before Mettaton screws up and shows his true colors, and when that happens, he'll be there, ready to defend his brother's honor in the most painful manner he can muster.
It just isn't happening nearly quickly enough for Sans' taste, and it's really pissing him off.
Even now, as he watches Mettaton smiling so genuinely at his brother, Sans can feel his normally chill attitude flaring up. Mettaton should be in a right snit, considering his date with Papyrus was all but ruined by Sans' insistence at tagging along. He isn't though; Mettaton never looks more than mildly put out, as if being with Papyrus is worth all the hassle he puts up with otherwise. Sans figures it's all a trick, and he never backs off. He'll catch Mettaton; it's only a matter of time.
…Right?
He glances at Papyrus, who looks even happier than he normally does. His brother has been on cloud nine since he and Mettaton hooked up, and that's really the only reason Sans hasn't just gotten it over with and junked Mettaton. He won't let Mettaton hurt Papyrus, but he isn't going to hurt his brother either. That's why he waits, keeping a close eye on Mettaton. He's even started watching those ridiculously tv shows the prima donna stars in, looking for any excuse, anything.
Sans turns back to Mettaton, and the way he's looking at Papyrus makes Sans want to hurt something. Mettaton is so… disgustingly devoted. Utterly enamored. He has it as bad for Papyrus as Papyrus has it for him. Sans almost wishes he'd just stayed home.
A thought comes unbidden to Sans, and it shakes him to his core.
'Why doesn't he look at me that way?'
No, no, he thinks, that isn't right at all. He doesn't want that—he hates Mettaton. Mettaton, who isn't good for his brother, who's sure to hurt him, who—
Who is so stunningly gorgeous as the light hits him just right that Sans' heart would skip a beat if he had one.
He quickly looks back at Papyrus, feeling dazed at this sudden line of thought that plagues him. It's a mistake.
'What do you have that I don't?'
Papyrus is his world, and Sans would do anything to protect his brother. The thought that he might actually be jealous of Papyrus is almost laughable.
Sans isn't laughing.
"Sans, are you quite alright, darling?"
Mettaton talks like that to everyone, so Sans knows it's nothing special—Papyrus gets all the really unique cutesy pet names—but his words definitely don't help Sans' current state of mind. It takes a moment for Sans to collect himself enough to answer, but if the look Mettaton is giving him is any indication, he must look anything but composed.
He mutters an excuse about not feeling well and flees as quickly as his pride will allow him. He has a feeling their date will be cut short because of his actions, but for once, that makes him feel guilty rather than satisfied.
Sans won't let anyone hurt Papyrus, and that includes himself. But what is he supposed to do now…?
He finally laughs, cheerless and empty.
'…I'm boned.'