This is my favourite blow job position.  The guy sitting, the blower kneeling, and his body forming a kind of alcove over the blower.  

As opposed to blowing a guy off where he's lying down and both people can't make eye contact, this position is perfect because both people can look at each other and take each other in, no pun intended.  It's also, I think, psychologically, a primitive thing: the man hovering over his loved one as a human shield, providing loving protection for the blower as he/she makes himself so vulnerable by servicing nature's need. 

This clip is not perfect, but it shows what I mean.  Both performers are also perfec sizes next to each other.