Began to form as he sat down on a nearby rock. He cupped his bulge and began chuckling dumbly, rubbing it up and down. Derrick knew somewhere inside him that this was going to be his future.
Derrick gained some common sense and began looking around for his clothes and luggage only to find they had disappeared. He laughed in a bovine voice, for some reason he found it funny. He couldn't go out like this, big hairy dick, he'd probably be brought back here, too far gone by now, Derrick rationalized. He realized he was drooling a bit and wiped it off.
Grok's neanderthal dick tented out far enough for his loincloth to fall off. Derrick stared in amazement and jealousy, it was at least 14 inches and not even fully hard. Grok tugged on the foreskin squealing in delight, as copious amounts of yellow precum dripped to the floor. He let it drip into his cupped hand until he had a good handful, then made his way over to a rounded stalagmite and lathered it up, arching his back toward Derrick. "Watch Grok. Entertain." He said in a brutish tone that he thought was seductive.
Grok squatted down on the phallic rock and went up and down like a rabbit. Derrick was transfixed by this, hands at his side, his caveman cock bounced up and down in time with Grok, flinging purely white precum onto the dirt halfway to the pool of Grok's pre. "You want. Drok?"
Derrick started imagining how that soft hairy asshole would feel around his shaft. "Yes, Derric- Drok want." His balls began to tighten as he gave into the haze he'd felt since he met Grok. "Drok want Grok's squirt-squirt."
Grok dug through the forest of hair on his chest to twist his mushroom head nipples, "Ooh, OOh, OOH, OOOH!" Grok spurted brown cum with the consistency of yogurt. He grunted, Derrick released a purely yellow load without even touching himself.
Grok's musk filled the room, intermingling with Derrick's.