(Jack is the name of the creature)

Kim did not have time to contemplate the pain for long as the beast became to roughly thrust in and out of her tight pussy, his growls of pleasure mixed with her moans of ecstasy as she was fucked like she'd never been fucked before. His tip butted against her cervix, her whole body on fire from the unbelievable sensations.

"Fuck me!" she cried, falling onto her elbows so her beautiful ass stuck up in the air, allowing the beast even better access to her divine pussy. As if understanding, the creature began to thrust harder, and she felt his cock swelling and throbbing as he drew nearer and nearer to spilling himself inside of her. She bit her lip, her tits shaking as his thrusts shook her whole body, covered in a sheen of sweat as she reached under herself to stroke her swollen clit, the combination of her over-sensitive clit and his ruthless fucking sending her hurtling over the edge as she came with a wanton, animalistic cry, her pussy squeezing around his cock, her juices flowing like crazy as her body was consumed with perfect hot bliss.

The beast was not far behind her as he began to shoot streams of jizz into her wanting pussy, growling until finally a great burst coursed through his shaft, filling her pussy to the brim. The beast threw his head back, howling, joined by a chorus of distant howls elsewhere in the forest, and by Kim's own ecstatic cries as she was filled like never before by the hot seed of an inhuman lover.

Kim awoke the next morning, naked, covered in scratches, and with a swollen ankle. She rubbed her eyes, feeling a dull ache between her legs and beginning to remember what had gone on the night before. Had it been a dream? It certainly didn't feel like it. She gathered what was left of her clothing and attempted to get dressed, staggering to her feet and trying not to put pressure on her swollen ankle. She didn't know how she was supposed to get out of here! She tugged her jeans on, attempting to button them and frowning when she realised they were too small. That didn't make any sense! They had fit a couple of hours ago! She scowled, eventually forcing them to close, but her swollen belly protruded a little over the waistline. She started to limp down the ravine, hoping to find a place to get out that wouldn't require any rock climbing.

After an hour of this, she had to stop, as she was beginning to feel nauseated and her jeans began to feel like they were squeezing her to death. She sat down, unbuttoning her jeans and pushing them off, sighing with relief. She lifted the remains of her shirt slightly, her eyes widening when she saw her stomach, round and firm as if she were four or so months pregnant. She ran her hands over her stomach, feeling a flurry of panic inside of her. How could she possibly be pregnant so quickly? And with something that wasn't even human? She gradually became aware of the heat between her legs, and how incredibly horny she was. As the beast seemed to have disappeared, she moved her hand between her legs and began to pleasure herself, though it felt nowhere near as good as that huge, throbbing cock between her legs. She rubbed her clit desperately, soft moans escaping her lips as she brought herself to climax again and again, her stomach growing by the hour until she looked a full nine months pregnant, her breasts having grown in turn and leaking small rivulets of milk.

As she brought herself to climax once more, the waves of pleasure were interrupted by a sudden contraction. She sat upright, clutching her stomach as she began to feel movement inside. She bit her lip, suddenly becoming aware of how very real and serious this situation was. She was about to give birth. She was only twenty-two. She didn't know what was going to come out. She could never tell her boyfriend. She might not even make it out alive. She felt another shattering contraction, getting herself into the most comfortable position she could and spreading her legs out wide as the birth began.

She felt a gush of fluid between her legs before the first offspring began to leave her body. She clutched at the ground and pushed as hard as she could, moving one hand to gently rub her clit to try to ease the pain of birth. With a slick sound, the first arrival landed on the grass. She sat up, seeing that her child was, like its father, a large wolf-pup, a blind newborn, attached still to its mother by the cord. She didn't have time to contemplate her young for long though before another wave of contractions started. Kim stayed for several hours birthing her litter, her moans of pain intermingled with those of pleasure as she brought forth each new life. By the end, she had birthed seven offspring. Exhausted, she laid down in the grass with them and they began to struggle for places to feed at their mother's swollen breasts. She smiled serenely, her previous worries forgotten, feeling immensely satisfied.

When night fell, Jack returned to her. He examined his young before licking their mother's cheek. She looked up at him adoringly, seeing his erect cock glistening between his legs. She knew she was his now, and she would give him many broods. When he howled, she howled with him. The beasts were real. She was theirs now.