Erotica about afterlife? Don't know if there is any
I know of at least one non do-over story which has a 'ghost' possessing the body of a comatose person.
In some aspects, many do-over stories involve at least one person dying and occupying another body which could be considered a 'light' version of afterlife.
There are a couple I can think of about erotica involving one living person and one from the after life:
Russell Hoisington's April Showers
D A Porter's A Most Unusual Haunting