and she just moved her leg to accentuate the wonderful curve of her thigh, calf and spiked heel.  It pushed a button I didn't even know existed and I came in her mouth.

......arse. The pads were placed in a way that as the unit pulsed, it caused not just my legs and arse to contract and release, but my groin also. I got really hard and she started to slowly stroke my cock and when she lowered her mouth onto me, I immediately shot my load.
It was before my accident and my trigger was way more sensitive than it is today. Sometimes, I miss those days.

I was feeling under the weather so reluctantly turned her down (we were new and like bunny rabbits then).  She said I'm horny, so watch this. Then she stripped down and held the vibe between her legs and told me to watch her face as she slowly built up to an O and came.  It turned me on so much that I came just from watching: didn't even touch myself.

Want to do a swap night?

and the gal suddenly leaned over and rubbed the tip of my cock against her hard nipple.

Boy, did I ever explode.

Beautiful girl was giving BBBJ and it felt great.  On the edge for over 10 min but did not spill for some reason.  Then she rested here warm [all natural] boob against my thigh.  Came in her mouth about 5 second later.

Girl was giving me a vigorous HJ and on the edge for over 10 min but did not spill for some reason.  Then she sat on my thighs with her warm naked ass and locked her eyes into mine.  Shot all over her hands about 30 seconds later.

A warm touch makes all the difference!

During a wonderful threesome, one lady was deep throating me while the other rimmed my ass.  Cosmic.

......if we can modify for a moment the topic to best experience cumming I have two.

Best feeling I had cumming was when a provider was giving me a great BBBJ.  I warned her that I was getting ready to cum, she kept going and as my first shot burst forth, she squeezed the base of my cock for a few seconds, then released.  OMG the feeling was fantastic!  

Best visual was with a Latina provider.  After I shot my load she let my cum drip out her mouth and onto her light brown breast.  When all my cum was on her boobs, she rubbed it in saying it was good for the skin.  She must of meant it too, for she got dressed and we walked out of the room together.  No boob washing.  As we walked in opposite directions, I kept thinking of those cum covered boobs.