Someone has their wrists locked in metal cuffs, usually pinned to a bedframe, chair, or held behind their back to keep them from pulling away. The vibe leans hard into BDSM control and helplessness, with the restrained person getting groped, stripped, and fucked while they squirm. A lot of scenes play up the clink of the cuffs, struggle marks on the wrists, and the power trip of the partner in charge.