fic: ain't this the life

ain't this the life (4760 words) by nilchance
Chapters: 1/1
Fandom: Undertale (Video Game)
Rating: Explicit
Warnings: No Archive Warnings Apply
Relationships: Sans/Sans (Undertale), Papyrus/Sans (Undertale)
Additional Tags: Underfell Sans, Underfell Papyrus, Friends With Benefits, Fingerfucking, Riding, sans is an uptight asshole, red is just an asshole, Together They Fight Crime, kustard - Freeform, offscreen established fellcest
Summary:

"You're not that stupid." Red leans hard on each word: "I can get you off."