>>90755
Sorry I took so long to answer, I was focused on making a drawing of the GUROchan mascot contest and some rl stuff.
Necrophilia is a wide term, so I assume you are are looking for the situation where the MC has sex with the corpse of his love interest not zombie girls and othe such variations.

Check this out first:
It's called Body Wash and necro it's the main theme:
https://vndb.org/v5210

Also this games has many hardcore situations where the female MC is raped after death:

https://vndb.org/v5210

You might also like:

Swan Song:
https://vndb.org/v914

The Sad Story Of Emmeline Burns:
https://vndb.org/v18460

HF!