Well, in the fanfiction, it might show Smithers' colleagues in The Simpsons trying to take care of him while he's sick. Homer could bumble his way through attempts to help, like bringing the wrong kind of soup or something. Bart and Lisa might also get involved, perhaps making get - well - soon cards in a very Simpson - esque, humorous way. The fanfiction could explore the different relationships Smithers has with the other characters during his illness.
The 'Smithers getting sick' Simpsons fanfiction could center around the mystery of what made him sick in the first place. It could be something as simple as catching a cold from one of the Springfield residents, or it could be related to some strange experiment at the power plant. As he gets sicker, his personality might change slightly. He could become more irritable or vulnerable, which would be a big change from his usually composed self. His relationship with Mr. Burns might also be put to the test. Mr. Burns could initially be dismissive of Smithers' illness, but then gradually realize how much he depends on him. This could lead to a heart - warming moment where Mr. Burns shows a rare side of himself by trying to nurse Smithers back to health.
Maybe it could be about how Smithers' sickness affects his work at the nuclear plant. For example, Mr. Burns might struggle to function without Smithers' efficient assistance, leading to some comical situations at the workplace.