Double Ejaculation

For the first time the other day I managed to cum twice within a minute at the end of an aneros session.

The night before I had spent four hours with my peridise, the first two having some of the most intense orgasms I've ever had with it. Followed by a couple hours sex chatting with an out of town girl while leaving it in. Then I finished up with an hour of helix before going to sleep without cumming. Before going to sleep my my cock was itching and tingling like crazy; so much that I thought I would surely cum just from it touching the sheets.

When I woke up it felt exactly the same, and I knew that concentrating at work would be impossible if I didn't take care of it. So I got my progasm and spent about 15 minutes generating some mini-o's before I couldn't take it anymore. Of course my first orgasm was crazy intense. But then, within about 30 seconds of finishing, my cock started tingling and itching again like I had never cum at all. The second orgasm was nowhere near as good, but still shocking.

I wonder what caused it. Maybe I had built up so much tonic dopamine that it overwhelmed the released prolactin. Or maybe for some reason no prolactin was released at all.

Anyone else ever have a similar experience?