I have found a way to torture my slave and stretch her limits a bit. Which she loves to have me do. I tie her to a chair and just use plain cloths pins on her nipples. I put them on for 15 minutes and take them off for 5 minutes. We do this about 6 times, that is about her limit... But when she lets me put a ball-gag in her mouth (that is her way of letting me stretch her limits) I can do it for as long as I wish... usually about 8-10 times. I can see the pain/pleasure in her eyes every time I put them on or take them off. After I finally take them off for the last time, I will suck and bite her nipples for a while before letting her go... Her nipples are usually sore for a couple of days. I am assuming I am not doing any damage to her nipples. We do this maybe once or twice a month. I have agreed to let her do it to me the next time. Hope I know what I am in for. I promised to use the ball-gag so I could not stop her...