Greyback didn't need the change to become the wolf. He would have killed Hermione with his own human teeth. Lupin didn't know why he thought she was safer with him. As they were well away from Greyback or any civilization at all the full moon saw through him and at once his bones began breaking and reforming into a monster. 'I need Sirius!' he thought through terror and agony. This place between hell and reality became a dream and Hermione's body became a wolfsbane of a different sort though not as strong. She was naked on the forest floor. Milky white in the moon pools, as though she were a part of the night sky itself, terrifying yet beautiful. The mating season of werewolves vibrated though his biological making. This body of his which so often betrayed him made the war within himself rage as though a victim of Judas's cradle were in his belly. What could he do? What the hell could he do? A scream like divine ice tore his throat like needles and as the last of his humanity slipped away from him he smelt relief.
Sirius black sprinted on his glossy four legs until he found them. Moony had obviously fought so hard against his curse and it had bought just enough time. Even in agony his dear friend was selflessly fighting. He growled viciously at the thing trapping his brother. Moony would take her if he didn't mark her as his own. What could he do? He stroked her soft skin with his tongue knowing it wouldn't be enough. Knowing that nothing would change what he had to do.
A howl split the night air drawing Hermione into conscience. With no idea what was happening, her mind drew the facts. Outside, cold, woods, moonlight, howl, breathing, headache, FULL MOON! She opened her eyes to see a sad, wounded Lupin whimpering and with pleading eyes begging her to stay away. She knew her beloved professor was there inside the monster that haunts him. She saw Sirius over her growling and whimpering. Noticing that she was awake he looked at her. His eyes were never more human than in that moment. The dog and yet the man. He looked so sad, apologetic even and terrified. She could have no idea what was going on when he stroked her naked cunt with his tongue. In her mind she felt pleasure with the warmth shutting out the cold against her skin in every touch but horrified. She couldn't scream or moan only tremble. He growled one last time and so slowly transformed into a human as he positioned above her. There was no time to do anything but save her. He did what he could, his soul swore it, but he couldn't save her from this. His erect shaft entered her. She screamed and he knew instantly that he had just taken her virginity. Guilt like death drew tears from his eyes as he pumped into her again. He couldn't help the moan, half pleasure half sorrow, escaped him as his head bent back. The tension and pleasure shook him and he trembled with her. It felt so good and so wrong. The wolf shook with rage while what was rightfully his was taken. He howled with anger. Sirius took slow smooth strides and as she relaxed, her body began to beg for more. The first true moan came from deep within her. It sounded only like pleasure. Her legs spread further, back arched, one hand gripping his shoulder the other in his soft black hair. He saw this change. His smooth stroked deepened and quickened, she groaned deep again and opened her body to him. "oh my god Hermione" he groaned and quickened yet more. This noise which burst from her was not a scream, moan, nor groan but a noise of desperation and desire. Pleasure spread through every vein like oxygen. "oh fuck!" his breathing couldn't be controlled anymore and he made quite a similar noise to her, almost a yell. Every thrust now erupted from Hermione a voice pushed from within her solar plexus. He was pounding into her steady and strong by this time. Almost to his limit he notices the wolf's claws digging into the ground as he watched them. Hermione's whole body shook and she orgasmed while he pumped into her hard and deep. Sirius followed her over the edge of oblivion, a true yell of release erupted from him as he fell onto her shaking with every unsteady breath. She felt his teeth on her neck and hot breath. He fought to breath calmly but it only caused his voice to push out into the forest with it. When at last alpha in him was calm and he knew the wolf was satisfied he rolled off of her and his chest moved freely with his heavy breathing. She saw him truly for the first time. Mind spinning, lungs splitting and eyes sparkling with adoration she saw him.
Padfoot curled up beside her. His gentle grey eyes looked at her. He was truly hurting. To show it he whimpered and touched his nose to her stomach. The Wolf was sleeping only a matter of feet away.