She’s one of extremely few with the ability to do this. She’s born with most of it and then she’s honed it. If you’re not born with it - which probably is about 99% of everyone trying - you should stop immediately and if your guy still wants you to try I recomend a swift kick to his balls.
I would love to go to a truck stop for just 1 Saturday night and deepthroat about 6 truckers like this. For free. Just for fun. Then go home and sleep well for the night.