You feel your ruined clothes slide off your swelling frame as you grow into inhuman size. You feel pain as you try to stand on all fours with your still mostly human hands. You feel your middle fingers and middle toes painfully elongate and widen while the rest of your fingers and toes get pulled aside and slowly assimilated with your horse legs. Nails and toenails painfully grow and harden becoming your hooves. You are thankful it's dark on the streets and no one is around as you feel your butt swell bigger and your anus moves outwards. You groan as your teeth fall out one by one pushed by teeth of a herbivore. Meanwhile your horse cock bobs under you before it starts touching your expanding belly continously as a sheath forms around your cock and connects to your belly. By now itchy white fur covered your entire grotesque body which made you a tiny bit calmer you weren't naked and looking bizzare anymore. You coughed as your chest started barrelling out which sounded more and more inhuman with passing seconds. Your neck ached as your head was dragged further from your torso. Pain of your body gaining so much mass and muscles in such short time was becoming unbearable. Your eyes teared up as your irises slowly shifted for better horizontal vision of a horse. Your mouth ached as you felt an intensive pulling sensation and in the meantime your cranium painfully deflated. As your head shape shifted painfully and you grunted like an animal your ears migrated upwards, thinned out and became pointier. Unbearable pain intensified as your head deformed further and grew in size. Mouth agape you watched cross eyed as a blind spot appeared and slowly pushed further, your nose flattening against your extending muzzle as your nostrils widened. You neighed not able to contain yourself and felt your head finally finish reshaping into that of a horse as last of your human hair fallen out, mane and fur replacing it steadily. You stood there shocked and uncertain what to do in a situation like this as your horse cock slided out of your sheath brushing against your coarse fur.