Check out a scene with Carlos Morales and Cameron Fox in
Branded by Falcon (FVP140 Scene 1).
It's an amazing scene. Morales is dripping precum like a faucet when he first sits on Fox's dick. (at about 16:00).
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He rides Fox for a good while with lots of flopping.
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When Fox starts power fucking him, he cums hands free--and just before he does, his cock stiffens so much that the flopping stops as he cums.
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This is one of my "go to" scenes.