It wasn't a promise, because it happened way too fast. Tao found himself turned, growled and just barely stopped fangs from lengthening. No marks, nothing permanent. He wanted blood, and bone. They rolled, he felt his body hit the floor hard a few times and then there were teeth. Throwing his head back he growled, his hand snapped up to press Riley's head into his shoulder. He reached down to grip Riley's thigh and pull his leg up and pressed his hips down into him. The pain, the power, and he wanted it all. He pressed down on Riley's head and positioned himself against his entrance. If he'd taken his time he would have thought of lube, of preparing him, but the pain was too acute and he thrust himself inside with a a sound that bordered on growl and purr.