Gag

A gag is a restraint accessory placed over or inside a character's mouth to prevent speech, commonly a ball gag, cloth strip, or ring gag, and one of the most frequently tagged BDSM props alongside rope and cuffs. It heightens a sense of restriction and vulnerability during bondage or captivity scenes. The tag applies to the physical prop rather than a specific act, appearing across many otherwise unrelated genres of gag hentai doujinshi. Top Hentai's library includes a steady stream of manga and comics featuring this restraint device.