Sans had gone to see Queen Undyne earlier in the day, but he came back near Sunset; Missing an eye and covered in red with a large hole in his skull

It was frightening, but try as you might, He wouldn’t tell you what had happened, he wouldn’t even tell Papyrus what had happened!

You did manage to convince him to let you clean the crimson liquid off of his head

“ Ow- Damn it,” He hissed when you pressed a bit too hard down near the wound