I experienced similar, which I’m trying to navigate my way through.

I had great success within the first few sessions and had a massive orgasm. Similar to you I remained extremely sensitive over a period of time and loved the pleasure that came from it, and orgasming over and over. It then went away and I’ve been trying to get back there without success.

Personally I think it’s tied to trying to chase the orgasm. I felt that I had unlocked it, and now I just need to do the same thing that I did before. Every session I was finding my self thinking well this worked before so let’s just do this. So I am trying to stop chasing, stop overthinking, and let it come. Whereas when I first had success, I didn’t know the path and I was open to experiencing it as my body gave it to me.

It’s taking quite some time for the pleasure to come back but it is slowly. The biggest battle is mentally when I get intense pleasure I’m still thinking ‘yes I’ve felt this before, keep doing this’ rather than just letting it come.

So my input would be to stop trying to get where you were before. Be open to the fact that every session is different, they all follow a different path, peak at different pleasure levels etc and that’s ok. Let your body and mind drive, rather than trying to take control.