Sometimes its fun to place bell in my slaves mouth during her tit torture session. The bell rings whenever they try to moan or scream, which in turn tells me that I have to increase intensity of tit torture session. After all, its every about infflicting pain, isn not it? & those moans & screams, & those flinches, all are proof that my punishment is having desired effect. If I want to discipline my submissive, I need to make sure she is really getting everything out of session that I want her to.