His cock slit from a sheath, like other canine dragons. It was a full foot in length, with a head that looked like a rounded cone, with a ridged cleft where it me the shaft. Ridges punctuated the fairly smooth shaft every inch or so, though the ridges themselves were wavy.
At the base was a hefty knot, not quite round, but with many flat faces, like a stone chipped halfway into a sphere.
It was a violet that matched the crystals, blue wisps dancing under the surface of the flesh.