A "Normal" Day

(Underfell fanfic) Papyrus knows Sans gets hurt a lot, and even if it doesn't do a great deal to his HP it's still worrysome. Pathetic excuses like "bumping into a tree" or "falling down" won't cut it anymore. Sans always wins fights, but Papyrus knows there's something he's hiding with all these wounds he has. The only place he sees him frequently visiting with other people would be Grillby's. Paps doesn't know Grillby that well, and apparently he doesn't even know his own brother's kink either.

Ships:
Main is Sans x Grillby but there will be Sans x Papyrus ("Boss") and plenty of not 100% consent, blood, violence, and abuse. Read at your own risk.