Your briefs unnaturally expand, something rustling inside.
You look back and with an inhuman flexibility rip the shred of fabric exposing your human pride. Growing larger. It’s expanding pushing it’s mushroom head toward your muzzle. You move your head right next to your pink cock head. And without a thought you lick. Sending a shiver through your body. You pant and sigh and lick again. Feeling your tongue caress your cock head. You can’t help but love the feeling so you lick again, greeted by an incredible taste, your salty precum.
Without any worry about being seen you sit on your haunches and continue to lick. You smudge the precum across your cock head with your tongue. It tingles and dribbles changing the gentle mushroom head into a pointy pre-cumming stick. Tingling you feel your own veins change, your meat moves becoming redder, more sensitive to your tongue. You can’t help but lick lower, harder. Feeling the change pulsating through your great meat. You lick lower around rapidly, feeling your cock expand pushing out around where you lick. Feeling the tender slick tongue, tickling your expanding knot, licking the start of your attaching sheath. Pulling your cock even harder, expanding the bones inside, yet you are compeled to lick further down, licking your shifting and changing canine balls.
Your testicles move and your cock feels tingly, you quickly move your face towards the tip of your bright red meaty cock. With a long lick your squirt and release your cum across your face.
With a smile you continue to lick, slurping and sending cum all over your face. A single drop stings your eyes and you yelp. Rapidly you try to lick and rub your face. Stimulating your nose, pushing out your nasal cavity. Changing your world from sight to smell. Changing your petite human nose to the canine black muzzle tip that you are now expecting.
When you can open your eyes again your vision has changed, darkened eyes sparkle with a wild canine look.