Leash

A leash is an accessory tag for scenes where a character is fitted with a lead, typically attached to a collar, and led or restrained by another character, a visual shorthand for ownership and pet-play dynamics. It's closely associated with collar, slave, and general BDSM tags, and is often used to signal a power dynamic even outside of literal pet-play settings. The prop itself, rather than any single act, is what defines the tag. Leash hentai doujinshi featuring this collar-and-lead dynamic can be found throughout Top Hentai's BDSM section.