Here is a feature-style look at the "Old Portable" era of this underground literary subculture: 1. The Era of the Pocketbook

It seems you're looking for (erotic or sensual stories) — specifically long-feature content, likely from the pre-internet era when such stories were shared via PDFs, e-books, mobile files (Java, .txt, .jar), or CDs/USB collections that could be carried around.