Doing this when he’s freshly showered and made sure to wash up there is very hot. If in doubt a condom on the finger works wonders!
You don’t realise the impact of prostate play on him though, until you watch him cum (or ruin) when you’ve rubbed up there (or a butt plug or vibe up there does the same).
Fountains. Fountains of cum. It’s amazing!

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