I have reached seventh heaven with this topic.
I always thought I may have been the only one to enjoy this form of cock torture, I suppose.
I have posted elsewhere in this site about my experience of having my foreskin forced back, and peeled all the way when I was very, very young by an older female. Some of the synechia which was attached to the corona of the glans, snapped, and pulled away. It was always a game of Dr’s & Nurses, I was always the patient. Her attention was always towards my erect penis and of course, the foreskin. She knew what she was doing, with hindsight.
Ever since those early days, I have “enjoyed” having my foreskin peeled back hard, jerked back hard, stretched back too its maximum - and then, stretched back even further! The feeling is intense. To see the inner foreskin taut and shiny on the exposed shaft, pulling away at the glans, seeing the sulcul groove flatten out so it is smooth the to corona and the shaft is what I like to see. I feel as if I want the inner foreskin to tear away from the glans where the join can be seen just under the groove. My glans bends backwards, distorting its shape, the frenulum close to snapping. One time, I had a Mistress force my foreskin back tight, and then she dug her fingernail deep into my taut frenulum as if to snap it. There was a little blood and to this day, there is a small little nick in the frenulum. When the frenulum is relaxed, a kink develops where the little cut is. One day, in a heavy session, I am sure it will snap! I also like the painful sensation of having something rasped over the inner foreskin where it joins the glans, when held back tight. Even a fingernail, or the back of a knife blade run along the join where the inner foreskin joins from the pale,white, stretched skin to the redness of the glans is incredible as it feels they are wanting to slice the skin here,almost somthat when the foreskin is forced and jerked back violently, it will snap and my erect penis will be skinned, degloved.