Someone gets restrained with metal cuffs, usually pinning their wrists to a bedframe, chair, or behind their back to keep them helpless. The vibe leans kinky and controlling, with the bound partner getting groped, stripped, and fucked while they squirm and pull against the chain. You often see cops-and-criminals roleplay or straight-up BDSM setups where the cuffs make the power dynamic unmistakable.