But none of that mattered, because before I could stop myself, I felt my cum pouring into Julie. Shame filled my mind as I slipped out of her and fell to the ground.
Julie snickered. "I knew it. I knew you would give in." A burst of light surrounded her, and when it faded, the half-nymph was no longer there. Instead, there stood a tall woman in Ancient Greek dress, with glimmering hair and skin that looked like it was carved from marble. It was Circe, mistress of Pleasure Island.
"I'm sure you're wondering what's happening, my dear. The answer is really quite simple. You were being tested. You see, no one can permanently exist as half-man and half-animal. Eventually, you would have to pick a side. Had you possessed the will to not cum inside me, you would have remained human. But it seems your animal instincts were too strong. You mated with me, and for that, you will now become a lion. Not a smart lion or even a clever one, but an animal. You will spend the rest of your days in my menagerie with the others who failed my test."
As she spoke, I suddenly became aware that my mind was turning to mush. First, I stopped feeling shame, and after that, I stopped thinking altogether. My anthro body began to shrink, my hand and footpaws became real paws, and I turned into a normal male lion. Circe giggled and reached down to pet my mane. All I did was lay down and let her.
"My beautiful sweet little lion, you will learn to love what you've become. Not that it really matters since you don't even understand what I'm saying, but I like to think a small piece of what you once were remains. Now, cum for me."
On command, your lion cock spewed out ropes of cum, all of it smelling distinctively human. "There. The last of your disgusting human seed has been expelled. Now you'll start producing good lion seed so you can mate. Speaking of which, why don't we introduce you to your new friends?"
As Circe led the new lion away, she didn't notice the anthro giraffe who'd seen everything.
"Mark, I swear I'll find a way to make you human again."