As you awaken, you feel stiff all over. You look over your body to see that overnight it has turned a shade of green. You begin to rub your body all over, feeling the texture of your skin, just slightly rougher. And of course, there's your cock, looking for all purposes like it's ready to impale the orc next to you, even soft. You begin touching it, as you growl slightly. You put your hand up to your mouth, scared at the change occurring within you.
You look down and see your nails just look slightly rougher. Getting up to a mirror, you see that your face is mostly the same, just slightly hairier, with a unibrow, and a slight underbite. Your ears have subtle, slight points on them.
You realize you can smell so much more now. You turn around to see him standing behind you, grinning. "You change much over night, you ready for the next dose". And with that, he grabs you. Your developing orc muscle isn't enough to stop him and he bends you over, impaling you. After a few short minutes, where you find yourself growling more than a little bit, he explodes inside you.
Heaving you down on the floor, you begin to cramp up, realizing your body is accepting the changes faster, while your mind still reels. Feeling your whole body expand slightly, you feel the fur begin to grow up your back on your spine. Your teeth swell, while your chin expands. You feel an awful headache as your brow bulges outwards with the monobrow. Your ears stretch. You begin to growl more, stroking your own cock until you orgasm, your new claws there in front of you.
"There, you now mostly orc", he says. You growl at him, but have retained your human mind. How are you going to get out of this? You are now half orc, but want to flee as fast as you can.