This is trained on artwork by SneakAttack1221 specifically images of breast bondage and cinched breasts. Seems to work well with other models.

Along with the trigger you might also want to try, breast bondage, nipple bar, piercings, ballgag, improvised gag, and other assorted kink prompts.

If you don't want any of the breast bondage elements then just use the trigger "c1nched" on its own and it should only use the art style.

Works best with WAI-NSFW-illustrious-SDXL

But please experiment as I have not done any exhaustive test of all of them.