My 1st domme liked to tightly tie rough twine infront of and behind my balls, and attach it to a head high hook in the wall. I was on my back, and had to arch up to move forward under her pussy. She sat on my face holding me in place, and if I relaxed the twine pulled my cock.

My 1st asian domme liked to tie the balls off and attach the rope to my ankles so I couldn't straighten my legs when walking. Walking in public it looked like something was wrong because I had trouble keeping up with her.

Also caning the front of my thighs so my legs wanted to straighten but the rope around my balls connected to my toes kept them from straightening.