I can't read the minds of providers who've done that for me, but from all indications and from what they've told me, they were enjoying doing it.  If they weren't, they were doing a great job trying to convince me that they were enjoying it.  

As an isolated event, it does little for me. In the context of a series of events that includes BBBJ and then ballplay combined with slowly using my hand, it's very erotic.

Then I am happy I am doing a good job. If I do it and there is no response, I tend to move on to something else.  

Let it be known that that act is only done on fresh balls smelling of soap. If, on the other hand, balls smell of anything else, that is off the table.

However CIM makes my motor run.

At my last encounter my balls were shaved clean and smelling fresh.  I asked her to lick and suck on my balls (I had never experienced that) and she did for a minute or so.  I really enjoyed it but wish it had lasted longer.  I could tell she was reluctant to do it but I appreciated that she did.

i see a lady who licks my balls while i jerk myself, then when i'm about to pop, i say "i'm cumming!" and she puts her mouth on me and takes it all in.

soooooo sexy......

My favorite sexual experience is having one lady lick the balls while the other sucks the cock like a popsicle.

Highly recommend it.

...... sucked in my right ball and played tug-a-ball.  
Absolutely amazing!

nothing better than the BBBJ.
I feel it is a tease but a naughty one that works well when done correctly

As long as they're not "low balls"
That guy from curb your enthusiasm did the funniest show about low ball syndrome.
That's just a preference and it's rare anyways.
It can be sexxxy.

I do shave completely down there, so no hair on my balls.  I've had many suck my balls and love the sensation of the tongue licking. The sucking and pulling action from the mouth is also a highlight for me but may not be for some as it is the sensitive area. The slight pain from a hard sucking can be exhilarating. No pain no gain -.

i love licking balls

Ball licking and sucking, as part of a blow job, is great.