Sure, I could arrange that. If I were to do that, I'd probably have a rope hanging down from a winch at the top, clip a carabiner to the rope to be used as a pulley, then I could run both the rope in his teeth as well as a rope from the nipple clamps up through the carabiner, have them tied together, and a small (or not quite so small) weight hanging from those ropes. So as long as he holds on tight to the rope in his mouth, he pulls that rope down, which holds that weight on the other side up. If he lets go of the rope, he lets the weight drop down lower, which would pull the nipple clamps up as a result. And using the winch up top serves a convenient purpose too...that way if I don't think he's having to work hard enough, I could always give it a few cranks, raising the carabiner (pulley point) up a bit higher. Then either his chest (nipple clamps) or his head (mouth) has to be held up higher to compensate. Get what I mean? And yes, he was enjoying himself just a bit too much...hmm, wonder if I ended up doing something about that? I did...but it wasn't involving his nipples. I took care of the slouching problem another way...