Quite a few years ago I had a boyfriend who had a rather large cock.  Out of the blue I decided that I was going to get all the way to the bottom of it.  Did it happen over night?  No.  It took tons of practice to finally achieve that feat.  Along the way I have discovered a few things about giving a mind-blowing bj.  First off the wetter the better!  That means spit and spit a lot.  Interestingly enough back of the throat spit is extremely slimey.  Another thing I realized is that the cock can be grabbed much harder then I thought.  Another must for a good bj is eye contact.  Every man wants to look into your eyes while his cock is in your mouth.  Paying attention and asking what he likes also is a neat tool for a good blow job.  Lastly, the rim on the head of the penis is very sensitive and does like attention.  Well I could keep going but I think you can see my attention for detail and my true enjoyment of doing it.  See you soon!