Hfwo without any pleasure

I’ve been practicing prostate play sporadically for over 10 years, mainly with Aneros products. I’ve had some success, but nothing close to a super-o or the intensity of a traditional penile orgasm.

I’ve tried every technique you can think of, but every session seems to have the same results – little to no pleasure for the entire session, but still always end with an ejaculation.
Just before the ejaculation however, my heart often starts to race and I feel some sort of buildup, always in the penis, for just a couple of seconds before the release. It doesn’t matter if I am totally relaxed, holding a contraction or pushing out. The ejaculation seems inevitable.

I don’t know what I’m doing wrong. I leak quite a lot of precum and I’m always very horny during the sessions. I think I’m in the right mindset, just trying to focus on the sensations and not forcing anything, without any expectations and enjoying every session for what it is. But now my motivation to continue starts to fail.

Does anyone have the same problem? What am I doing wrong?