Due to tumblr's search algorithm being so incredibly ass I cannot find the original post for the fucking life of me. I search the exact wording of the post and get Hetalia x reader fanfic. Help.
Begin with an infinite polycule where all members except one are cucks. The origin point of the labyrinth is a square room containing a bed, in which the non-cuck individual is having sex with someone outside the polycule, and a cuck chair in the corner containing a cuck who can directly observe (cuck[0]). There's an open door with a second cuck chair, positioned to have a view of the cuck[0] but not the bed itself, in which sits cuck[1], who is getting off on the conceptual cucking the cuck[0] can see, but they can only infer. The hallway from the bedroom wraps around in an infinite spiral, with an additional recursive cuck at every corner capable of seeing only the previous cuck and getting off to the imagined cucking happening at the point of origin. Thus we have created the recursive cuck labyrinth. (This setup has been dubbed by a friend as Plato's Allegory of the Goon Cave.) (This is NOT a metaphor. It is my infinite recursive cuck labyrinth.) The setup can be greatly simplified by simply not informing the cucks of their position within the recursive cuck labyrinth. Rather than an infinite amount of cucks spiraling outward from the origin, four cucks can be arranged in a square formation. The recursive cucks will believe there is, somewhere down the line, a cuck[0] observing a bed where they are getting cucked, but in reality it's just a square of four guys jerking off. (This is not philosophy. It's my finite recursive cuck labyrinth.)
Quote from The Old Astronomer To His Pupil - Sarah Williams