Abandoning myself to sensuous indulgence, I climbed to my knees and leaned over to press both my hands against Blackie's shoulders, near where his smooth neck met with the bone of his collar. The muscles of his shoulders were round and firm, and ever so pleasing to the touch. I squeezed them, and straddling him in such a way as my rapidly engorging penis came to perch upon the crevice of his bottom, I began to massage his back. Extending my fingers, pressing the palms of my hands into the flesh and musculature which spread to either side of his spine, I gradually worked my way both up and down, all the while stimulating my cock with a sliding motion to and fro along the crack of Blackie's firm ass.

“Oh, Charlie!” he said sleepily, “do give me a fuck!”

How could I possibly resist such a tantalizing offer? Immediately I moved behind Blackie and whispered for him to rise up on his haunches, fearing he would scrape his delectable cock on the rough surface of the boulder.

But he sat up rather quickly and replied, “I've got a grand idea!” and with that, he jumped up and led me back down to the softer sand, just where the ocean was moistening the shore with its gentle lapping waves.

He bent down and quickly dug a little hole and then, to my bewilderment, lined it with a bit of wet seaweed. Promptly he flung himself upon the damp sand and placed his cock in the hole.

“Now Charlie!” he laughed, smiling at me over his shoulder.

Delighted with the idea, made more enticing by the mild spray of ocean mist that lightly dappled our bodies, I fell to my task at once. I got behind Blackie and began to rub my cock back and forward between the cleft of his tight little buttocks.