| 'Shiki's Diary' from 'Nowasure' by Shiwasu no Okina, translated by Tadanohito (registration required, single chapter re-hosted here).|
This story contains another important sort of mother, the step mother. Why, without step mothers how would you have pseudo incestual stories like this one?
Calling this a milfesque story, however, is grossly misleading. There is a brief scene at the end with pseudo milf/step son/step daughter taking a bath together, but the bulk of the story is just one man walking orgy. Many encounters don't even make it to the page. It's breathtaking, handily my favourite SNO story.
Most of the rest of that tank is similarly, if not quite as, fantastic stuff; though the first few chapters tragically involve a nice lesbian couple going futa.
Btw: Nurses, ehh. Teachers, kinda hot. School nurses, love goddesses?