You shook your head, and pulled your hand away. You had come in here to get clean, not make more of a mess. And you weren't horny.
...Were you? Your cock wasn't hard exactly, and the strange feeling wasn't one of arousal. But a tension was spreading from your groin out into your torso and down your legs. Your muscles drew taut. And with your attention on it, your dick did start to rise, the itch becoming an ache as your heart began to pound.
"Aw fuck..." You shook your head, strands of wet hair sticking to your face. Determined to focus on the shower, you reached for the soap. However you fumbled it as you felt your cock clench, now at its full six inches, and -- you could swear -- harder than it ever had been. You cursed as the bar of soap landed on your toes. Bending down to pick it up, you gasped as your free hand found its way to your erection.
"F-f-fuck!" So intense! Well, why not I guess... You straightened, already squeezing your wood, and blindly shoved the soap back into place. Immediately that hand went to your cock as well, the soapy film serving to lubricate your organ and -- and God it felt so good, you began to thrust your hips, moving the soap-slick shaft through the squeezing tunnel of your fingers.
Suddenly your temperature jumped, and you shivered, feverish under the water, gasping and then grunting in pain as your body cramped. Hunching over, you heard your spine crack, and felt your skin stretch uncomfortably as bones grew and muscles swelled beneath it. You had to pull a hand off your cock to catch yourself as your over-tight, burning sinews threatened to dump you to the ground. Yet at the same time, your balls tightened, and before your eyes, you saw spurts of thick cum shoot out to spatter on the wall and the shower handles.
But orgasm brought no relief! Not from the insane lust, nor from the pain. Your fingers clenched, the darkening nails of your left hand digging into the tiles while your right tightened around your maleness. "Oh... oh fffuuuck..." It felt bigger -- thicker -- more powerful in your grasp. Between your now heavy, solid thighs, you became pressingly aware of your balls, engorging rounder and weightier with thick seed.
"Wh-what..." Your arms also bulked out, the hair on them growing darker, thicker. In seconds they went from "hairy" to furry: thick, coarse black fur that covered everything except your palms and fingertips, which grew rough but still sensitive pads, making you clench in need as they rubbed over your shaft. That too had changed, was changing as you watched, skin pulling back under your fingers to reveal silky flesh that turned from hot pink to deep, angry red. The head warped from mushroom to flared point, the base swelled out into dual bulbs that you couldn't wrap your fingers around.
"Th-the...!" Myth Wave! You couldn't talk through the pain, only do your best to keep from falling, toes curling as they plumped into paws, heels lifting painfully to become hocks.
The sight of the canine cock disgusted you -- but you couldn't stop squeezing it. Even as your scalp prickled, dirty blond hair falling out to be replaced by rough fur. Even as you grunted through cracking jaws as they pushed out into black muzzle. Even as you blinked in pain while your eyes burned, blue irises turning red, whites turning black.
Even as you screamed when your spine and skull erupted, blood running across your thickening fur as your ear canals shifted and horns pierced the skin above them; and bone spikes pushed out in a ridge down your back, and your damn tailbone grew out into a long, sinuous length of black flesh tipped with a hard, pointed spade.
Your tongue hung out now as you panted, lolling over your aching fangs. Hot drool dripped onto the shower floor and sizzled. You were trying hard not to black out from the agony. But still your hand pumped madly away at your fat, twisted cock. And then --
You arched back, an animalistic howl tearing from your upraised muzzle. Bones popped, the pain vanished, and your body trembled with infernal heat and strength as you achieved your second climax. The seed was even thicker now, and smelled intoxicating potent, with hints of smoke and sulphur. Was it...? It was -- your cum was glowing a hot yellowish white.
Spent, you leaned back against the wall, watching in disbelief as your now eight-inch cock slowly deflates, the bulbs shrinking back into it as it sinks down into a new, soft-furred sheath. Letting the shower rinse off the pre-cum and semen from your hands, you reached up to feel the long, broad muzzle that you could see in the bottom of your vision.
The Myth Wave, you repeated to yourself dazedly. I've been changed! I'm... What? From your muzzle your hands moved up to feel your horns. You recognised your dick as a dog's, but... what kind of a dog had horns? Reaching down, you grabbed at your long, skinny tail and pulled it in front of you, to stare at the wicked-looking, off-white bony spike at the end.
A demon...? You wondered, stomach knotting. Demon dog?
Hellhound.
The name struck a deep chord in your new self, and you shivered. You didn't want -- but then your thoughts were derailed by someone else's scream of pleasure. Ben!