Step 3: close legs, tighten muscles. The hard on mounts, the cock pushes toward the pee opening of the cage but cannot go any further. The erection is mostly internal and forms a rock hard “cord” between the back ring of the cage and the anus squeezing the prostate
I gotta admit I love it when he plays with my thongs (prior to sex). This one guy I knows likes to put them in his face, take long deep breaths...he absolutely loves my scent...or he hold them in his fist while we're making out and/or fucking.
It's very erotic.
Sometimes he' ll keep a pair...