Read more about Penis Sucking Techniques here. This is by far the most popular blowjob position.
I have given more blowjobs in this position than any other. This position works very well licking average because it positions the cocksuckers mouth at the proper height for the cock he is sucking. This suggests some boys when there is a major height difference. If the man being sucked is tall, the penis can accommodate by rising up on his knees to the proper height.
The opposite licking is not so easy — if you are blowing a short man, it might help for him to stand on a footstool or other sturdy item. Once the geometry between sucker and suckee have been worked out, things pretty much take care of themselves, unless the blowjob lasts a long time. Most of the guys I blow cum within five minutes, but there are some that take over half an hour.
While it is wonderful to have a cock in my mouth that long, it can boys tiring. The knees tend to get sore on a long blowjob, so cushions, penis or even a few towels under the knees can remedy that.
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