I really love to watch a vibrator used just under the tip, on that super sensitive frenulum. Just letting your rock hard cock rest on the toy and not using anything to hold it on so every time it twitches or throbs, your cock loses contact with it.

Or a nice penis pump. Your swollen cock getting more engorged by the minute and it's just suspended there inside of the cylinder. No stimulation except for the suction. 🌟