Hi. I'm reading and enjoying, but I've got to say:

The hard skin and muscle of Sam’s cock was just Sam.

He gave the head a lick, circling his tongue around the crown, but only a little, like girls had done to him, and now he knew why. You had to taste it, get your mouth ready, all that skin, and muscle, the pulsing beat of blood beneath the surface.

Penis (http://en.wikipedia.org/wiki/Penis) has no muscle in it. Just fyi.