I can't recall the name, but it was about a prisoner forced to scout a weird alien entity that had attacked a colony of miners. What it was is a weird alien worm that assimilates the women and breaks them down into pretty much just vital organs, and uses their wombs to birth young. They exist in a mind realm of their own control that slowly gets more and more twisted and depraved.

I couldn't find the story looking through this board, /lit/, and any archive I could find. Anyone who saved it I would appreciate a link.