Something more was happening to Cody though. His sheath throbbed hard as he could feel his human cock flexing strongly inside with each lick, swelling and eventually popping out against the dog's tongue. The boy gripped onto the desk a bit with his hands, blushing and moaning.
"Ohhh Roscoe...please...stop...ohhh". He really wanted it to stop at first because it was pretty intense and strange...his shaft was burning with heat. The pounding heat got worse, Cody's shaft becoming more pink as it stood up erectly against the dog's rough licking tongue.

"Ohhh...ahhhh" the boy felt dizzy, his penis throbbing and jerking painfully like it was fighting to hold back what was about to happen. But no matter how much he resisted, the intensity just overwhelmed him.

The boy moaned hotly as it looked as if he had just experienced the start of an orgasm only instead of cumming, his cock flexed upwards sharply, throbbing and plumping up about an inch bigger, his glans changing shape becoming more tapered at the tip...The boy moaned again, relaxing more and blushing as another stronger spasm of pleasure hit and his cock surged two inches bigger, the base of it bulging out noticeably into the shape of a wide knot.