So uh, I fell back into old hyperfixations. I took inspiration from the sad state of the Sans decal on my highschool backpack.
I've had this backpack for 4 years. It's been through a lot. And so has Crushed!Sans. I'll probably just start calling him Crushed for convenience. Below are the wip drawings, and below that, the story of Crushed.
Okay, lore time. Heed the tagged tws for this.
Crushed became the way that he is now due to some save file corruption. Well, the permanence of his injuries at least. Long story short, after enough genocide runs, Sans had a "what if" thought. "what if I sat this timeline out?" So, he essentially threw himself off a cliff. Frisk saw him do this, and reset before he could dust, but after he was injured. In doing so, cemented his injuries as permanent. Sans and Frisk's theory is that the injury caused enough of Sans' potent magic to flare up at the same time as Frisk's reset, that they canceled each other out. Thus, everything but Sans' injury was reset.
Sans explained to everyone that his wounds were caused by an accident, that he slipped and fell face-first into some rocks. Almost everyone believed him, no questions asked. Papyrus and Alphys were suspicious, however.
Papyrus has known Sans way too long to think that Sans would just let himself fall off a cliff like that. He knows that Sans' mental health isn't the best, and that he struggles with depression that suddenly got a lot worse with the past few days pre-injury.
Alphys also knows that while Sans may be lazy, he isn't clumsy. With an HP of 1, he can't afford to be. Not to mention that with wounds that were actively bleeding magic, he shouldn't be alive, let alone not Fallen Down. She knows that something timeline related happened, but Sans won't say anything to her.
(Un)fortunately for Sans, Frisk decided they'd had enough genocide runs. Feeling guilty enough from causing Sans' current state, they did a final pacifist run and broke the barrier. On top of that, they broke the reset button to prove to Sans that they were done resetting. Sans was both relieved, and disappointed. On the one hand, he won't have to see all his loved ones die again. On the other, he's stuck like this.