Not my model:

https://civitai.com/models/1392460/over-the-mouth-and-hair-gag-illustrious-otm-oth-gag

It creates an over-the-mouth gag that gets over the hair and wraps around the subject's face.

Trained on over 220 selected and hand-tagged images (realistic ones).

It can create gags of different colors. You have to add "(your color) gag".

To reinforce it, you can optionally add "gag over hair".

The model has been trained with images that contain several roped models, so you can experiment with "bound (legs, knees, ankles, breasts)" and shibari.