Starts with the classic 'Creepy dude preying on women is fallen on by his intended prey' but then it continues and is creepy awesome.
I didn't at the start understand why the narrator's equating their lover with the aliens, but by the end: yes. Yes, and so poignantly.
Why do wildly different aliens so often subsist in such similar atmospheres to our own? That's not the point of this story, but it has an implicit answer to it anyway.