Very sexy! I love doing this with my husband! It does release the erection but he says it's worth it (and it always comes back!). Thank you for sharing!
Good going. My first sounding rod is about the same diameter as yours about 5mm I have had 22cm of this inside, but I had a hard on at this length. I have cum with this inserted and the feeling is intense. I also sound with 6 and 8mm rods but not as long. There are vids and photos on my page, take a look and comment