As someone who has played on both sides for many years, my "top" play is fully informed by being a "bottom," too. As a sub, I have connected with professional dommes around the country and have been fortunate to play with some of the best. In the spectrum of sub play, I will claim to be very experienced, but not "extreme." As I have written before, such descriptors are tricky; one man's extreme is another man's mild. There are levels of play beyond my interest - blood, permanent marks or scars, extended confinement and what might objectively be called "edge" play, such as authentic consensual non-consent. The real pros, I have found, are conscientious about safety, hygiene and communication; the one I see monthly is now nearly psychic and her insights (descriptions of her observations of my reaction) are almost scary.
Last fall I booked an eight hour marathon that involved her and three others. Although I had offered some ideas in advance, what I got was on the far side of that. Perhaps the most intense part involved a leather sleepsack with internal sleeves. Once inside, I was blindfolded, ears covered and gagged, they then used metal packing strips (in spools) to screw me onto a 4x8 plywood platform - I was already immobile, but could hear their electric drills and felt the tightening strips. The platform was hoisted from the floor using straps hung from the (basement) dungeon ceiling to about their waist height. Then the sack was unzipped at the center, exposing my genitals. An electric butt plug was inserted, followed by electric pads on my balls, electric strap on my cock (base) and an electric cap with an electric sound. The photos later showed that she had 4 control boxes, operated by at least two of them.
For 10 - 15 minutes, they varied the voltage, pace, patterns, etc. to elicit the responses they wanted and to enjoy my predicament. Once they figured out which settings were the most fun - for them - she said "hand me that black case on the table behind you." A total mind-fuck, as I knew the box held her violet wand and accessories. What followed was all of the estim connections working + the violet wand over any exposed tissue, including against the metal corona cap. Had I not been restrained, I would have levitated. As it was, I was (muffled) screaming and trying to writhe. [We do have a safe word, but I've only used it once - ever.] After about 5 minutes of that, everything stopped and I was cut out. It took quite a while to come down from that - physically and emotionally. I was determined to ride the ride, and I did, but it took all I had to endure. In the moment, it was one of the most intense physical experiences of my life.
What went through my mind? "I can do this, I can do this, CAN I do this?" "What else is coming?" "They can do anything they want and there's no way to stop it." "It feels good - it hurts like hell - it feels good - OMG!!!"
More about this another day.