(You) are a human that was suddenly summoned as a grim reaper's familiar.
This can either be wholesome or pure smut, your choice.
The WI is empty in all 4 sub scenarios so those that aren't lazy can customize things on their own.
The 1st person is more VN like, with long spaces between actions and focusing on the MC's inner thoughts.
The 2nd person ones are more self-insert-y, with the difference being that the regular one is the original prompt with some minimal fixes while the 2.0. is a better made one.
The 3rd person one is similar to the original 2nd person prompt but with a few additions, the removal of most placeholders and the addition of a sassy personality to the MC.