Riding The Ankylosaurus

The ankylosaurus began to wave his whole body now, undulating back and forth.
"That's pretty cool, Marsh. It's kind of hypnotic." Sheldon was only a few away from the creature now.
"Kind of sexy, too. Those spikes look a little sea of penises, waving back and forth."
"You're getting hard again, Marsh." Sheldon could feel his own member growing as well. "Me too."
"Take off the jock, Sheldon. Let him see what you've got."
Sheldon shucked the jock and his cock stood up proud and strong.
That got the ankylosaurus' attention. He turned his head to Sheldon. Sheldon's body was now a foot from the creature's mouth. The dinosaur's tongue shot out and licked Sheldon's erection. Sheldon gasped but remained still. The creature continued to lick up the shaft, around the tip, then encircled Sheldon's whole cock, squeezed slightly, then swiftly up, and spun his tongue from around the erection.