Fingering Prostate

I’ve been fingering my prostate with my thumb for a bit now, and it honestly isn’t terrible. However, the reason I’m coming on the subreddit today is because every time I finger my prostate, it almost feels like it… “flattens” Usually when I start out, I can feel my prostate (which feels like an engorged bump along my front wall) but as I keep fingering it, it almost seems to “deflate” and all I’m left fingering is this almost vascular texture against my front wall. I thought maybe I’m just fingering myself too hard and I started being more gentle, but the same thing happened. I wouldn’t be making such a big deal about it if it weren’t my sessions going off the rails whenever this happens. Along with this, I don’t feel any pleasure from stroking this vascular structure. Do any of y’all know what this could be and if so could you give me tips on my technique so I can maybe avoid this or work with it?