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I was reading @abadtime's fanfic The best of times the worst of times ( it's about gasterblaster!sans). And while reading it the idea of sans being in physical and mental pain - trying to find someone, anyone to help him - got stuck in my brain. Also this wasn't in fanfic, but I really enjoyed the idea of Grillby finding him like this, getting totally freaked out, but still trying to help (also, sans vomited on him, just to get things even more weird...)