My fic, The Perfect Specimen, focusing on an impregnation fetish as Twilight uses magic to give herself a cock with the intent of finding a way to balance out the ratio of stallions to mares (1:8). It doesn't feature any such impregnation yet, and I was wondering if it could technically fit in here.

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From my understanding, impregnation themed stories go in the "other" folder. From there, it goes in the sub-folder labeled "Conception".