I like a soft hand on my balls rather than a tongue flicking. I have to say a recent session was completed with nipple nipping with the teeth. It was an awesome experience on that occasion and one I had never really experienced before in this manner. I guess it was the technique and the fact that my calls were lightly stroked at the same time.
I was doing the job - I really struggle to ejaculate easily - and this is where it starts and stops as everyone is wired differently, and how we approach the session and how we feel and the girl herself and who is in CONTROL.
If you the ML after several previous sessions it may be a better result than the one off - as a regular knows your buttons to push and weaknesses what works what doesn’t.