After my Dom had gotten me to tie my foreskin with cord so that my dick was trapped inside me, he said I had to cum like that. Holding the wand against where my dick used to be I was able to get enough sensation to cum, especially with comments from my Dom. It was incredibly frustrating to feel myself cumming but not getting enough sensation to enjoy it, or even seeing the result till after I untied my dick. My Dom did enjoy seeing the sad leak when I untied. It was an interesting experience