SexyStranger
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Monstrous Heroes by Wistful Mindscape reviews
The whole of City Z shook as a mysterious house appeared in the street. Little did they and their protector Saitama know that these new visitors would bring destruction, hope and determination. Pacifist ending. SPOILERS FOR BOTH SOURCES
Crossover - One Punch Man/ワンパンマン & Undertale - Rated: T - English - Humor/Adventure - Chapters: 10 - Words: 42,860 - Reviews: 82 - Favs: 167 - Follows: 183 - Updated: 1/13 - Published: 10/28/2016 - Saitama, Papyrus, Sans