You crawled onto your bare feet, a struggle with the mind-numbing throbbing from out your green erection. All 12 inches of it pointed froward like an arrow, like an ominous pointer to your imminent future of hair, green skin and muscles and...
You groaned, rubbing the sweat off your forehead as you moved forward and walked away from the large, man of an orc behind you. With your underarm exposed, you could smell the slightly changed smell of your body - something jock-ish and beginning to drip with masculinity. You expected to be followed, man-handled and brought into the embraced of the orc, a thought that felt darkly appealing to your changing cock. To bind yourself arm and arm in sex and...
"Stop it!" You hissed, catching yourself reaching for your cock.
And yet as you walked you realizes you weren't being followed. But you could feel the Orc glairing you down, his greedy eyes patiently waiting for his meal to return. After a minute you risked a glance behind you and saw the Orc standing naked and cross-armed with a bright grin. You could see his pearly tusks from here and wondered what yours would look like...
"No," You whispered in half-hearted assertiveness. "Don't think like that."
Eventually the Orc disappeared from view and you had only the company of vast trees, the warm, hot air and your own nakedness. Your head began to pound almost as hard as your cock, a sudden envy of the Orc's magnificent form polluting your thoughts. The things you could do if you worked a form like that... You would not be human, true, but with a body like that...damn.
You hand began to draw close to your cock and before you could catch yourself will gave way to flesh and your soul was plunged into a realm of physical delight. You began to drool from the pleasures, quickly collapsing onto your knees as you pounded away. Between moans and gaps for air, you'd clench your teeth so hard you swore they should have broken. Your pubic hair grew denser yet gain, a heavy trail of hair tip-toeing up and clouding your navel, the skin around your waist beginning to develop a subtle, greenish hue. Your nipples followed suit, taking on a green as vibrant as your cock. Your pecs began to swell as all over your musculature grew slightly, hinting at the developments to come. The pleasure burned your flesh as you let out a heavy sight and deep, glutaral moans.
Your legs itched and you noticed small amounts of dark hairs growing across them and then a new pleasure strangled your flesh. You body tensed and boiled as you found your musculature again growing denser and clearer - across your fine, lean form developed small and light but clear muscles like a runner, or any other lean athlete. Two canines on your lower jaw ached only slightly as they grew thicker and longer.
And then you came. Submitting to it all, you rolled onto the ground and watched as squirt after squirt escaped you and splattered onto the forest floor. As bit by bit, your humanity slipped away...