Note posted on February 14, 2021
After a serious discussion with my distinguished colleagues, we reached this conclusion: there must be a circle of Hell where you do Satan's chores.
These include cleaning his laundry, mopping blood off the hardwood floors, cooking meals of burnt flesh and hot sauce, and doing his taxes. At first, I wasn't sure if people did taxes in Hell. Then someone pointed out that there are arguably more taxes in Hell than Earth because taxes are Hell. If anything, Hell needs more people to handle everyone's taxes, including Satan's.
But one question remains: what circle of Hell does all this domestic labor happen? How far down the sinning scale is doing Satan's dusting or dropping off his library books?
More research is needed.