[StealthyKitten]

Nipple Clamp based:

Submissive had nipple clamps with a chain attached so the chain is behind their head. If they don't keep their head down the clamps will be pulled.

Multiple Submissives:

Two submissives tied to eachother with a double ended dildo in their mouth. When one moves back, the dildo goes deeper in the other's mouth.

Two subnissives attached together by nipple clamps, when they move it pulls on them.

Miscellaneous:

A rope attached to a submissive's hair and anal hook/underwear. So that if they lift their head from being bent back they get a wedgie/a deeper anal hook