When making a decision on which position you should give your man a blow job in - I would suggest you to go with the flow. If you've been with him for some time you might already know what he prefers - the problem is that he probably didn't see all the positions you could be in, so he doesn't actually know what he likes best.
A third of your success when giving him a blow job is based on how you position yourself. Comfort is key. The more comfortable it is for both of you the better. If you're not in a comfortable position then you won't be able to relax and focus on enjoying the whole thing.
