For a brief moment you stand stunned as the magical feeling spreads through your body. Waves were almost electric at first, but soon they became more violent. Before you could react at all the waves focused on specific parts of your anatomy and then it began. You yelped as your spine slowly started creaking, it arched and forced you to lean. You clenched the magic stone in your fist harder as your posture altered unpleasantly. You stared startled as your arms started bulging with muscles, bones strengthening and reforming. Your arms were becoming bulkier by each passing second. As your spine finished augmenting, you tried to catch your breath after these exhausting changes but you felt as if your lungs were paralysed. You started panicking, but then the paralysis ended suddenly and you yelled as you felt your lungs expand and grow along with your chest. Your skeleton morphed and your chest barreled out, while you hyperventilated in shock and agony. You wanted to feel your changed chest with your hand, but then it too started changing. Your fingers fattened and morphed beyond recognition, slowly becoming some sort of animal paws. Your nails started bleeding and darkening, curving and becoming long claws. Black paw pads emerged from palms of your hands. You tried to flex your fingers, but realised it was impossible, your hands became paws of a wild animal. You didn't have time to mourn the loss of hands as you felt changes targetting your lower body now. Your stomach growled as your belly grew outwards, becoming inhumanly big, similar to that of a... bear. With so much weight on you, you couldn't stand straight anymore, you fell forward onto all fours. You tried to stand up, but suddenly felt a huge discomfort in your hips as they widened. You realised you would never stand up again as your skeleton became quadrupedal. Your legs ached as muscles became bigger and skeletal changes progressed. Your legs became hind legs, your feet just finished changing similarly as your hands previously did becoming paws with deadly claws. You groaned as your spine lengthened. Slowly a new appendage grew out above your butt - your tail. You couldn't believe what just happened to you, how was this possible? Why you? Your entire body gained mass and grew and your pores opened, thousands of hairs started growing, becoming your fur. It momentarily covered all your body. You were distracted by your itching fur, and you haven't noticed as your penis became erect. Then the most painful changes started as your head slowly drifted away from your torso, your neck broadening and extending agonizingly slow. You tried to focus and attempted to call out for help, but your vocal chords were already gone so you only growled confused. You shook your head chaotically as you knew what was coming next. You gasped as your teeth started bleeding. You reached your front teeth with your tongue and as you toched one it loosened and fell out of your mouth, horrified you wriggled your tongue as more teeth kept falling out onto the grass below you. Your gums throbbed as razor sharp teeth slowly emerged from them. You reached your face with your bear paw trying do stop the transformation, do anything. Your human mouth was too small to contain your numerous huge bear fangs and so you growled in pain for this agony to just end. As if on cue, your face started pulsating. Your entire skull was wrecked with pain as it contorted stretching your skin to it's limits. You roared in pain as your jaw started growing out, soon your nose started migrating downwards and fusing with your upper lip. Your eyes watered as your face continuously stretched out more and more resembling a muzzle. In the meantime your ears malformed and migrated higher up your head becoming rounder. As the changes of your skull were getting more drastic, you thrashed your head harder from pain. By now you were entirely covered by dark brown fur, except for your head. Your human hair started falling out in clumps and you were bald, but not for long. Your by now inhumane looking head contorted even more as your forehead started compressing disturbingly. You groaned as you remembered that not your whole body was done changing. Your constantly erect penis was still human. You moaned as your penis was getting closer to your belly, as your tip touched your belly you felt the foreskin around your penis growing tighter, your penis was also growing. You watched petrified as your foreskin fused to your belly. It felt so tight down there, soon you saw why. Your member began to extend out of the tight foreskin, further and further. Meanwhile your balls migrated closer to your asshole and grew in size getting furry. Your penis was as wide as a kitchen roller by now. The tip was getting wider than that. You were starting to dribble precum unwillingly. The pleasure was cut short by several aches in your face. It no longer resembled a human face, your mouth finished elongating into a bear muzzle. You sneezed as your nose was blackening and getting wet, growing triangular. Your eyes stinged as they moved and changed a bit. Your neck ached as fur grew along it, soon also covering your head. And with that the pain ceased, immediately after you felt more pleasure coming from your groin as if it was paused by the changes. Your bear cock waited in anticipation long enough, you felt waves of immense pleasure as you groped your balls with your animalistic paws. The pleasure cumulated and your penis was almost entirely out of it's foreskin bobbing, you started furiously stroking it with your coarse paws and couldn't keep it in a second longer. You roared in ecstasy as you ejaculated what felt like a litre of cum. For a moment you had to settle down after the most pleasurable moment of your life just sitting there splayed out. You were now a male bear, you were happy at least that you didn't lose your humanity, mentally.