Guilt.

"You can never undo what you did to him." A voice behind Cesar said , When Cesar got almost his whole body and mind back,Cesar looking at Mark and his bloody hands , make him want to tear up. How could have he done this to Mark? Then he realised,it was an alternate. Him as an alternate.
But not after long, he meets up again with his old friend which "he" tormented.

More of this fanfic contains Cesar angst so yea.

TW: Su1c1de,mentions of death and blood, etc

story cover - Credits to the original artist !!