That the head of your cock was slightly green. At first you swore it was a trick of the light. Next you assumed it must be some kind of grass or anything simply staining your skin. Then, examining yourself closely, you knew it was just skin. Your skin. Then a warmth trickled down across your rod, making you grunt slightly and grimace as you saw the green coloration spread until your entire cock was a vivid green. It seemed to grow in length and girth as well - you could see veins popping along it as if it was overflowing with energy. The it rose, slowly and pleasantly popping to full mast until it felt as hard as steel.
You closed your eyes and bit your lip, resisting the urge to pound away deducing what inhuman fate awaited you if you caved in. Looking down at your chest, which buzzed in a unique way you couldn't describe, you saw that your nipples appeared slightly swollen, and they too appeared to be taking on a slight, darker green hue around their edges. It felt alien to see this colour on you, you heart pounding and mind struggling to override an overwhelming primal urge to cave into desire. But then staring at your fully green cock, something felt strangely right. Your balls began to swell, and almost immediately you could feel them starting to pump a new kind of testosterones throughout your naked flesh. A kind of inhuman spark to shift you along the way...
You began to smile, feeling excited.
No!
You shook your head clear and clamored onto your feet and walked onwards, quickly but carefully. The lust pounding at your loins was making you lightheaded. Furthur, the air around the forest blew across you, tickling and soothing your flesh. It seemed to urge you to rest a while, treat yourself...Give in it said.
You moaned in confusion, burring your head into your hands as you slumped against a tree and feel to the floor. You cock was pounding and your head was spinning. Looking down, sweaty and tired and overwhelmingly hard, as instinct began to hardwire itself into you...