Guys?Have you ever taken the time to work a woman into a hot frenzy? If so, have you ever taken notice of the size of her outer lips? Inner lips? Position/accessibility of her clitoris? Noticed when the blood begins to concentrate in her nether region?
Watching 'mother nature' work like that is real nice! Add to that site/observation, your womans responses to your efforts is irreplaceable!
Wondering if anybody, male or female, wishes to comment.

stretch and squeeze around her vagina while she masturbates me.

We do this for the better part of an hour and I love to see her quim fill up with juices as I do that.

Tantra - great stuff that.

I love seeing that.

Yes.....Tantra is an amazing art form.  I am still learning new ways and techniques of incorporating it into my sessions.

Re: That's me after a nice session with my vibrator Mmmm it gets the blood flowing. - e -

Always start a punt with the intention of giving pleasure to my lady. the payback in mutual pleasure is priceless. if all she wants to do is lie back and think of England / Uncle Sam, I loose interest.

Yes, that vision is priceless! I once saw a friend's amateur porn movie with another girl, and the camera focused on this. I was so aroused by it that I realized my own labia were as swollen as could be and my panties completely soaked. One of those rare times I had to go to a public restroom to quietly get myself off. I realized then that this is one of the things missing from mainstream porn and why I don't much find it a turn-on. (The other thing missing is a focus on the man's face as he feels pleasure- you barely see that.)

The look of her eyes as she experiences an orgasm is priceless!

This is but one aspect of the concept of total presence - something that anyone familiar with the basics or tantra (or really, many other spiritual traditions) would recognize.   One of the most difficult aspects of the hobby is that much is boiled down to merely the physical.  Even that can be exciting if it is openly and honestly expressed.  But as in any other relationship, the minute anything is faked or concealed, real connection becomes nearly impossible.

Tuning into the reactions, observing the responses, whether they be swelling, reddening, flushing, contractions,... sounds, smells, tastes....   is a great way to get two spirits tuned into the same place.  And that is when amazing things happen.