Best Blowjob ever

I 28 dated girls and done fairly well; I'd heard stories of fantastic blowjobs. But was always left unimpressed by the ones I got. Finally, I was between girlfriends and visiting my family. My parents and sister 22, my brother 25 is in the army, she could be called nerd, she studies all the time never dates. Doesn't dress to impress, but she wanted a new special computer, she couldn't afford herself. Our parents had planned a trip of their life and so had no spare cash available at that time. I was financially very comfortable, my sister thought of asking me. But wouldn't be able to pay me back anytime soon. She offered to anything I wanted in return for the computer, a first for her. But she really wanted that computer, my response was like what. She had nothing at first to offer, then said I could take her virginity. She was really desperate; I said No to that offer. But suggested her giving perfect blowjob, including swallowing all my cum. She was shocked at first, as I was that I had asked her do it. But she said she didn't how to do a blowjob, which I took as her agreeing. Said I'll teach you and once you give the perfect blowjob the deal is completed. Adding it might take a few lessons first, she agreed straight away. But we couldn't do it there and then, we needed to be somewhere alone and have our parents walk in on us. I took her to get her special computer that afternoon and she spent the evening setting it up. Next morning we went to a motel on the interstate to start her lessons. Nervous at the start and a very awkward first attempt, but with each attempt she improved greatly. Returning home still not having had the perfect blowjob, Next day same thing different motel. She was a lot better from the start and after a few tries, we went and had lunch and a bit of a break then she tried again. This time she had my toes curl up it was fantastic, even my sister knew it was fantastic. As I recovered and about to say that was it. My sister suggest we do it once more, but this time in the (69) position. I agreed and we both got off. That was months ago, my sister visits me and we sleep together no intercourse, but 69's. I've become addicted to my sister's mouth.