When I (female) stimulate my boyfriend's prostate with my finger, my overextended 2.5" finger barely grazes it since it can hardly curve toward his belly. As a result, it is extremely difficult to apply pressure.

I have tried using a curved, vibrating plug, but since I am only able to apply pressure on the outside, I am unable to consistently feel his prostate and apply constant pressure in the correct spot with the toy.

I have tried to find a finger extender online, but I have not been able to find one that has wide external base wings to prevent the toy from slipping inside. I would also prefer to have at least half an inch extension on my finger, and all of the ones I have found are too short and would be more of a finger sleeve than a finger extender at all.

I have been looking into a hollow butt plug or a hollow dildo with only one open end and slipping a small vibe in before my finger, but I cannot seem to find one that would be appropriate for this particular usage.

My boyfriend prefers smaller girth, but he has played with up to 1.5" diameter, and he is comfortable with that so long as it is tapered. He would like it as firm as possible without sacrificing comfort and regardless of weight. Realism, texture, color and price range are unimportant. Shopping in USA.

Any suggestions?

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P.S. We have dabbled with pegging, and I also have difficulty knowing where the strap on is exactly inside him and where it is in relationship to his prostate. The kink stimulation and grinding make up for it for him in this case, but advice would be appreciated. I imagine it just comes with more experience and additional literal poking and prodding and figuratively poking and prodding to get him to give feedback lol