I’ve been using dildos for prostate play for years although I’ve never had anything like a super O, and I’ve also had very sensitive nipples since I can remember.
I recently bought an aneros helix syn in the hopes of finally having a hands free orgasm and I’ve played with it about three times in a week. The first time, I just stuck it in and jacked off and it was similar to using a dildo–an enhanced feeling of pleasure and slightly drawn out orgasm. The second time I tried not to touch my dick and just played with my nipples. I was getting abdominal twitches and could feel my balls twitching, but I ended up playing with my dick a little and came–the orgasm was amazing but it wasn’t hands free.
The third time I think I definitely got O waves–this time while barely even touching my nipples I was getting abdominal twitches and had moments where I was got these strong, pleasurable numb sensations from my thoughts up to around my navel (it felt like when you walk into a hot shower or get into a hot tub and get those warm chills). Was that an O wave? I got so horny that after about tell minutes and maybe three or four of those numb sensations, I just grabbed the base of my dick and came. It was powerful and the feeling of horniness didn’t subside for maybe a minute after I started shooting–there was still a lot of warm pressure in my abdomen.