Losthi
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Neon Moon by taitofan reviews
Sans doesn't trust Mettaton with his brother. But maybe Mettaton isn't the one he has to worry about.
Undertale - Rated: T - English - Romance/Family - Chapters: 5 - Words: 5,270 - Reviews: 28 - Favs: 79 - Follows: 59 - Updated: 11/30/2015 - Published: 10/15/2015 - [Mettaton Ex, Papyrus, Sans] - Complete