"Oh..ahh..." she gasped as she ceded control of her form to her animal side. Her eyes blazed yellow, and she smiled at me. "Oh, Joey...this feels...this feels so...soo," she ran her fingers down her naked torso, stopping at the top of her slit, "Sooo...right!"
I was quite hard already, becoming more aroused by the second. My mind was beginning to cloud up, becoming full of thoughts of rutting with her. Her ears elongated, becoming pointed, poking through her hair. Her teeth grew into fangs, and for a moment or two, she looked like a goth boy's wet dream; quite vampiric.
"Grr...graahh!" she growled, snarling slightly, "Come on, Joey...I don't need my brother now, I need my LOVERrrrrr!" A couple extra sets of breasts had begun to blossom, and talons were shooting out of her nail beds. I could feel my control slipping away quickly, as my hands automatically peeled my shorts from my hips, and my cock waved in the air, erect.
Her body began to tremble, black fur racing across it. She struggled to get nearer to me, and I was overcome by the smell of her musk. I couldn't help myself; I gave into the animal, and joined her, covering her in fang-filled kisses, nipping at her neck, her tits.
She ran her claws down my back, raking it open, and just as quickly, it healed. I roughly threw her down on her stomach, and she raised her hindquarters in the air, still quivering as the changes finished. I slammed into her, and we rutted ferociously, collapsing on the floor of the living room, still knotted together until our changes reverted.
Soon enough though, our bestial desires were sated once more, and indeed, we did revert back to our more standard shapes. (Although it DID seem that her tits were a little bigger, and her tummy just a little flatter.)
Then...