How a dry orgasm should feel – how is it different than an ejaculation orgasm.

I’ve never tried aneros, but I’m planning to get one. I keep flexing my PC muscles for training and for sexual pleasure, and I tried some anal toys for prostate orgasm. I always get to a point where it feels very-very nice, my body is in tension, I feel that I’m near the point of no return, but I always had to finish myself manually, because “the big O” never comes (pun not intended). So, what should I feel, what is a dry orgasm, and how it’s different from the ejac orgasm – will there be that pulsating feeling, or something will happen elsewhere in my body? Thanks for your answers!