Looking for a prostate dildo

I’m looking for a toy for my husband to stimulate his prostate during oral.

We’ve played around with a few smaller butt plugs, but he wants something a little bigger or at least more stimulating. He doesn’t want anything metal or glass–possibly a stiffer silicone/dual density?

I’m not sure if there’s a toy that can overlap, but he’s also interested in trying pegging. I’ve never used a strap-on before, and I’m unsure if they need a particular base shape or not to stay in place. If they don’t overlap, I’m also interested in suggestions here.

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