I was doing a lot of driving trying to get my hours up so that I could take my driving test.  Since I only had a permit, I had to have someone else in the car with me.  I would drive my sister around and take us to school and back. I was learning all about road safety and the topic came to distracted driving. No texting and driving and that kind of stuff. I joked about still being able to get a blowjob while driving though. I said "I couldn't be distracted even if that was happening. I would be able to focus, no problem".

 She smiled at me and said that I was full of shit. She bet me that I wouldn't be able to handle it. I told her "well, I don't have a girlfriend so I don't think that it even matters". We were in a very large parking lot practicing parking, and she told me to just drive around and focus.

She leaned over and unzipped my zipper. "Whoa, what are you doing"? I said. "You need to practice distracteed driving, so just drive and relax. She pulled my cock out and got comfortable. She took the base of my cock in one hand and put her lips to the tip of my cock. She looked back up at me and said "just relax and drive, try to focus. I bet you can't handle it", I agreed to the bet, and with that she turned her attention back to my cock which was rock hard by now. Her mouth was soft and wet, she engulfed me all in one motion.

I couldn't believe that my sister was giving me head while I was practicing driving! Her mouth was amazing and her hand worked the base of my cock like a charm. She was so generous in the way that she gave me head. She used the perfect blend of masturbation and suction to really work me over. I could feel my orgasm building up and said "Oh fuck, I am going to cum"! she exclaimed "just focus on the road" then offered her throat to me.  She was sucking my whole cock deep when I released in her throat. She took it all like a pro, she didn't gag or spit, she swallowed it all.

 It was increduible, nothing like that ever happened to me before. She later told me that, I won the bet. "What is the prize?" I asked. "you aren't ready for the test yet, so you have more driving lessons coming up" she said. With a coy little look, she turned around and walked off.