#472520 - With the first step being the length of an individual story, then the length of a series, the last step in the discussion of length becomes your continuity. Ego-driven motivations aside, most erotica authors are more interested in the erotic portions of their stories. Each one of these criteria I listed play into your style, and each will change, even if only slightly, from story to story.
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Kusuo saiki
More of your feet pls
Kurotsuchi
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