I've been having M2M sex for quite awhile too, starting at 13, I'm now 49. My dick has been in a lot of mouths and I've experianced the same sucking technique you described only without the same results.
It may sound strange but if a guy is sucking me and changes technique as I'm about to cum, it's a orgasm killer. That's not to say I don't cum, I do, but not with the intensity I would have if he had kept on sucking like he started out. I guess I get into some kind of groove and any unexpected changes in sucking technique throws me for a loop. I've had guys that only wanted to jack me off and then 5 seconds before I cum they start sucking. As much as I love to have my cock sucked the sudden change always throws me off.
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