"What the fuck are you doing to me!" Jeff yelled, rage his reaction to this whole ordeal, and once more met by a proud and joyous laugh from the chief.
"That's it, human! Let your rage out!"
The orc steps closer to his captive, standing above him, gloating. It pisses off Jeff even more, confused and with no idea what was happening. He wants to get out of here, stop whatever is going on, and kill this orc that had just fed him his spunk. With a yell, he pushes forward to hit the brute in the chest, but is restrained by the chains and bindings. Landing back on the wolf pelt.
"Only an orc could break chains like those, you're shit out of luck, human."
Was that a challenge? Jeff's mind immediately accepts it as one as he gets up once more and went for another charge. His legs stronger, quicker, mightier. Joining his cock as they turn a shade of green, thighs meaty and strong. Feet large and heavy. A trail of dark black hairs spreading down his legs as he rushes at the chief once more. The chains creaking, steel still holding the changing man back as he is once more pulled to the rug.
"A runt of an orc could do better than you!"
"SHUT IT!"
The anger swelled, starting to overtake Jeff as he felt nothing but primal rage. Body starting to swell with power, chest and pecs defining as they too turn gain that green colouring, dimmed only by the thick black hairs that coat his pecs and abs. Jeff now larger and broader than any human could manage, arms becoming their own behemoths as the change affects them as well. Growing rapidly like a boy suddenly reaching maturity, years of raiding and pillaging being implanted into himself as his muscles develop. Arms thicker than an adults neck, hands large enough to grab a human by the head.
The chains grew to match Jeff's new form, but they do not restrain him for much longer. With a grunt, he gets to his feet and pushes forward. The bindings shattering into a pile of metal as he breaks free, and punches the chief in the stomach. The older orc being knocked back a few inches, but still standing firm and proud.
Jeff stood still, panting. Head pressed forward as the rage subsided, and it became hard to think. Clarity barely finding the monstrous man, as the green had stopped its assault at his neck.
"What... am I... doing..."
He dimly let out, trying to make heads or tails of this situation. Finding anything to latch onto, and seeing the answer with his green cock throbbed. Damn he is horny, more aroused than he has ever been before. His oversized hands wrapping around the cock, stroking the head from top to bottom.
"Let it out, Graj. Then join the others outside, we leave this camp soon."
Jeff, or more accurately, Graj obeyed his chief. The last vestiges of his humanity being eliminated as the wave of changes finally spreads to his head. Jaw squaring and head growing in size. Ears becoming pointed and hair reforming into a short bristly black cut. Mouth agape as his bottom teeth spread to make room for two mighty tusks, jutting out even as he closes his maw. Brows thickening and eyes becoming a dull yellow, the orc overtaking the man as he lets out a few more grunts, then paints the fur rug underneath him in earthy spunk.
Satisfied, Graj instinctively rolls his shoulders and flexes. Looking to his chief with a grin.
"Sorry bout that, chief. Going to wait with the others now."
His boss grinning back, as the new orc leaves the tent, and joins his fellows.