As Jesse ran his penis responded first, moving slowly up attaching itself onto his navel, covering it in a swath of white fur. His balls moving a bit higher between his splaying ass cheeks just under his anus, soon the sheath appeared with a nice red cock pushing out above the waistband of the Speedo. Jesses hands grew furry as his pubic hair softened in to fur spreading up the stomach and across his chest. Meanwhile... down donkey beach Josh never broke his stride as a brown ropey tail shot out from his butt over the top of his own Speedo. Jesse began panting heavily as his tongue dangled out of his mouth, face inching forward forming a proto muzzle. The two boys seemed to be keeping their human shapes but little else, neither seeming to care about their changing physiology.
Finally their undergarments ripped open and fell away as they ran, but it didn’t matter because an elastic like flap of skin now held their sheaths in place. Jesse bonded along at an inhuman speed, now leaving over sized paw prints in the sand instead of human footprints. Despite Joshes new package attached to his abdomen his new donkey dick managed to flop around quite a bit. The two young men could hardly keep their minds off each other as they made their way towards the lighthouses at almost identical times. Josh galloped on his newly hoofed feet gaining ground over Jesse, his strong muscled legs giving him an edge, both boys felt as if they could run for miles, every step brought more changes. Fur sprouted, tails waged, claws slid forth and ears lengthened as they neared the finish line with Josh in the lead.