You wouldn’t believe how severe some men that call up for cock and ball torture can be. It’s almost comical the scenarios they have in mind when they devise ways for me to think of hurting them. Some go into full on castration mode and I describe fully cutting off their manly bits. One had experimented with sounding, where you side a weighted rod down the cock and it stretches the urethra and is supposed to feel very stimulating. He was using things he really shouldn’t have though, and that’s not wise, you can injure yourself if you aren’t careful under the best of circumstances.
I suggested he try something different, so I had him fill up a drinking straw with water, with some tape at the bottom of it so it would freeze in the straw shape. So he had a frozen spike basically. He was on cam as I watched him and he slid the spike down his cock and the heat from his body made it go in fairly easily as it melted the outermost surface of it and he started to pump and as he did and it continued to melt, little drops of water leaked out from the tip of his penis.
He said the cold feeling actually was pretty neat, since his cock was so hot and he loved the contrast of the hot and cold. Temperature play combined with sounding. He could have just taken one of his weighted steel rods and placed it in the freezer for a few moments, or dipped it in a glass of ice water, that would work too. He came in a gush and the rest of the spike melted fairly quickly in the rush of sperm escaping his cock, it was pretty thin to begin with and that just finished it off.