Ring Gags: The Slavegirl Service Device

Most ring gags are smaller than this. The model looks like she's really straining to keep her composure. This being a Sex and Submission video, she's probably going to have a cock in that ring gag very shortly. And she'll have to accommodate it ... the gag will see to that. That's the whole point of ring gags. She'll probably be glad to be put back in her cage when her owners are finished with her
Image source: Kink.com shoot 5456, "Welcome Carly Parker and Her Amazing California Body to Hogtied," starring Carly Parker and Matt Williams.