Having the best of things, by being able to lay down, while being sucked off, and doing nothing but enjoying the feelings.
The Receiver (one being sucked off) lays down on a sofa, or at the side of a bed.
The Giver (one doing the sucking) kneels beside them, and administers to the penis, orally. (Like not Rocket Science, is it?)
This position affords the Receiver to be the center of attention, without having to do much of anything.
Of course they can still caress and fondle the Giver's head and upper body, while the Giver can have full access to the entire front of the Receiver's body.