"The Dream of the Fisherman's Wife"

by John Hornor Jacobs

originally published The Book of Cthulhu, Nightshade Books, 2011

Maebe and Laura work in a restaurant in a coastal city (presumably Innsmouth).  A handsome guy who's been hitting on Maebe for some time asks her out. This time, the widowed Maebe finally accepts. While he makes love to her, Laura knocks him out.  They drag him out to the shore, castrate him.  Deep Ones, or Deep One-like creatures, including Maebe's husband, come forth to accept the sacrifice.

Very atmospheric in its final scenes, but not much going on here.