Sidney knew that the week was going to be rough when she woke up feeling hot. It was as if she had some kind of full body fever, but when she felt the slick between her thighs and the need to be filled, it instantly became clear to her what it was she was experiencing.

She was going into heat. Her first one.

Sidney was a late bloomer, she knew that. So many people she knew had already presented and not only had gone into heat, but had already been marked by their mates.

Casey Becker, an Omega, with her boyfriend Steve Orth, an Alpha.

Her best friend, Tatum Riley, was also an Omega (although she acted more like an Alpha herself) and had mated with Stu Macher, who was surprisingly an Alpha; everyone always believed that he'd end up being either an Omega or a Beta with his personality, but he was most definitely an Alpha.

Christina Carpenter (one of the cheerleaders Sidney hated for her snobbish attitude and her tendency to flirt with her boyfriend Billy, even though he wanted nothing to do with her) was an Omega and had already been marked and mated by her Alpha boyfriend, Lucas Carpenter. She had even given birth recently to Samantha, their daughter.

There were countless others who had already gone through what Sidney dubbed The Change, some she knew personally and some she didn't. Usually a wolf presented around puberty and took about a year or two to fully mature before having their first heat. Sometimes pregnancy followed and sometimes it didn't; despite the urges, a lot of them were teenagers and all, so it was understandable why a lot of Omegas chose to be on birth control.

Sidney presented as an Omega when she was thirteen, a usual time for wolves. When she began dating Billy Loomis, an Alpha, two years later, it was expected that she would mate with him and he'd mark her, but it didn't happen. She knew it wasn't because he didn't want her because he did, he made it perfectly clear every time he saw her (especially when he was in his rut) that he desired her, but he also loved her and knew she wasn't ready and, patient and kind and gentle like he always was to her, accepted that it wasn't the right time for her body or her mind.

Being the only Omega who presented when she was supposed to, but hadn't had her first heat yet made Sidney self-conscious. She felt like she wasn't good enough for her boyfriend because how could he possibly be satisfied with his unmarked Omega girlfriend who's never had a mating cycle? Would he eventually get bored of her and find another Omega who was ripe and ready for him?

But here she was, seventeen and finally ready to jump her boyfriend and ride his cock until he flooded her womb with his breeding cum.

Sidney groaned, the mental image of Billy filling her up and knotting her made her body hotter and her pussy wetter. She rubbed her thighs together to get a bit of friction, but it didn't help. What she really craved was her boyfriend's cock…his thick, hard, Alpha cock just pounding into her willing body until he released his load inside her, seeding her with his baby.

Her phone rang from beside her and she moaned pitifully, reaching over with a shaking hand to answer. Lifting it to her ear, she asked, "Hello?"

"Hey, Sid."

Billy's husky voice filled her ears and more slick dripped from her pussy. She swallowed the whine building in her throat. "Hey, Billy," she whispered.

Alpha.

"Are you okay?"

Alpha.

"Y-Yeah."

Alpha.

"Are you sure? I can feel that something is off with you. You can tell me anything, you know that."

ALPHA!

Sidney cried out as a sudden cramp filled her stomach, whining as she placed a hand down on the area. She knew what it was; her heat was hitting hard and pain was quickly mixing with her desire.

"Sid?!" Billy's voice rose in concern.

"Alpha…" Sidney whimpered into the phone.

There was a silence on his end before he stated, his voice dark with something primal, "You're in heat."

"Alpha, please…I need you."

One sharp inhale and then: "I'll be right there." The phone clicked and Sidney blindly set it aside, not caring what happened to it.

Sidney stayed curled on her side, clutching her stomach as waves upon waves of agonizing lust flew through her body. She needed to be bred; her womb needed to be filled with every drop of her Alpha's cum. She'd either go insane or die if she had to wait any longer.

She heard her door open and the heady, masculine scent of Billy filled the air. She took in one deep breath and slowly sat up on the bed, watching with hooded eyes as he came towards her.

His eyes were so dark she couldn't see the brown anymore, his lips curled and nostrils flared as he took in her scent. "Omega…" He released in a throaty growl.

Sidney shuddered, frantically removing her clothing and spreading her legs, exposing her soaked, pulsing pussy. "Please, Alpha," she begged.

Billy's growl turned into a snarl as he all but tore off his own clothes and climbed atop her, hovering over her and shoving three fingers into her virgin pussy.

Sidney cried out, arching her back in ecstasy, ecstasy that increased when his lips wrapped around her breast and sucked hard on her nipple while his fingers pounded into her tight pussy, the wet sounds of her desire for him reverberating against her bedroom walls.

"Please, Alpha, fuck me!"

Billy smirked around her nipple and pulled his fingers out of her, his mouth following as he stared into her eyes, sucking her slick off of his digits. "You taste so good," he purred. "I'm definitely going to want to tongue fuck you later, but right now…all I'm going to do is slide my cock into your pussy and breed you like the little bitch you are."

Sidney moaned loudly as Billy gripped her hips and spread her legs wider until she felt her thigh muscles burn. "Ready?" He asked, the head of his cock poised at the entrance of her pussy.

She nodded. "Take me, Alpha. Make me yours."

Another growl fell from his lips before he thrust inside her to the hilt. He nuzzled her in comfort when she let out a small pained cry and the scent of blood hit his nose as he took her virginity. He left sweet kisses up and down her neck, stopping at her ear as he whispered softly, "Do you want me to stop?"

Sid shook her head. "No," she answered. "Just…stay still for a second."

Billy did as his Omega asked, refusing to move until she told him to. He really loved her and wanted her to be his mate; it was his duty as her Alpha to keep her safe and taken care of. It was only her whispered "you can move now" that spurred him into motion, pulling out of her and then connecting their hips once more.

Within seconds the air was filled with the scent of sex and the sounds of their pleasure. Sidney felt that consuming heat in her abdomen slowly ease as her Alpha took care of her. Her legs came up to wind around his waist, her nails digging into his bare back as her pussy was repeatedly filled by his massive size.

"Feels so good, Alpha," Sidney moaned, feeling him push past her cervix and enter her womb.

"Fuck," Billy snarled, the wolf within him rising. He could slowly feel himself giving over to the beast, to the primal instincts that screamed at him to bite her, to claim her, to fill her womb until she was leaking and heavy with pups.

"Pleeeeaasseee…" Sidney whined, her orgasm building so fast she knew it was going to be explosive.

"Please what? Tell me what you want, bitch," he demanded, pistoning his hips so his cock hammered against her womb. He could feel his balls constricting as they filled with hot cum. He was ready to flood her sensitive walls, but he wanted to hear her beg for it first like the good little mate she was going to be.

Her Alpha's filthy words brought her closer than ever before to the edge. "Breed me. Please, Alpha, breed me! Fill me up and give me your child! Make me cum!" Sidney screamed, the coil in her belly curling tighter with each heavy thrust into her willing body.

The satisfied roar that answered her desperate plea was nothing short of animalistic as he thrust one last time into her, locking his knot as thick cum poured heavily into her pussy, filling her womb to the point where Sidney knew that if he pulled out of her right now, it would spill from her entrance. The feelings that their orgasms caused were heightened when his fangs sank into her neck, marking her as his mate forever. He felt a similar pricking in his own neck as Sidney's fangs made contact with his skin.

'Mine,' Billy thought.

'Yours,' Sidney responded through the mental bond that they had just created.

Sidney fell asleep soon after, Billy's knot locking them together and their mating marks pulsing pleasantly as they laid in a close embrace.

Intense pleasure flooded Sidney's body as she woke, quickly becoming aware of her surroundings.

She found that she was lying on her stomach, her hips raised into a doggy style position as a cock drilled her insides. But not just any cock…

Sidney's eyes widened as she felt the soft fur against the skin of her back.

Oh.

Oh!

"Fuck," Sidney whispered, her pussy fluttering as she felt Billy's wolf cock pump deep inside of her. Her mate felt bigger as a wolf, his claws gripping the soft flesh of her hips, his knot catching on the edge of her pussy with every thrust.

'Mine!' A possessive voice growled in her head, his pace growing faster and harder.

"Uh, uh, uh, uh," Sidney grunted in time with Billy's thrusts, clenching her comforter in her fists as she focused on the feeling of his cock rearranging her insides. "Fuck, Billy!"

'My pussy!'

"Yes, your pussy!" Sidney panted, closing her eyes as she quickly approached her orgasm. From the sensitivity that she was currently experiencing, this wasn't the first time he fucked her as a wolf.

The thought of him turning into a wolf and fucking her pussy while she was asleep made her wetter, her eyes rolling into her head as she moved her hips in time with him, chasing after her release.

"Alpha, Alpha, Alpha," Sid chanted, her body rocking forward as the beast behind her mindlessly used her like a rag doll. She felt his knot swelling behind her, her excitement growing as she realized that that would be buried inside her again.

"Knot me," Sidney begged. "Knot me, Alpha, please! Fill me again! Pound my tight little pussy with your huge wolf cock and flood my womb with cum! Ruin me!"

Her words encouraged the animal. Snarls and growls fell from his mouth as he mounted her, plundering her pussy and, with one hard slam of his hips against hers, buried his knot inside of her.

"Yes!" Sidney wailed, throwing her head back in ecstasy as she came hard, squirting all over his cock.

A roar so loud she swore she felt her house shake filled her ears as wave after wave of hot cum shot into her pussy, past her cervix, splashing against the walls of her womb. He bent his head down to her neck, inhaling the mixture of her sweet aroma and the heady scent coming from his mark.

As Sidney slowly came down from her high, she felt Billy's wolf softly lick her mating mark, a moan escaping her as he did so. She felt so sensitive, but she loved it. She wouldn't mind it if he fucked her again, even if it would ultimately lead to her being unconscious.

As she began to fall asleep again, a pleased growl reverberated from the wolf's chest, one thought standing out in her addled, blissed mind:

'You've been pupped.'