Warning: If prompting image with bondage, gag may appear around mouth. To fix, try inpainting face without bondage prompt.
Works better locally
Prompting guide
Use any of the below bullet points for the socks themselves.
[dirty] {color} socks in mouth
[dirty] {color} sock in mouth
Optionally add additional gag over the socks (may not work well):
and transparent tape wrapped around mouth
and white cloth wrapped around mouth
and rope wrapped around mouth