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Susie did her best to keep her mind off of Sam when she was on the treadmill.

When she was doing lunges in front of a full-length mirror, she was looking at her thighs and focusing on her form, but she couldn't help her thoughts drifting to the horse of her dreams as she stood back upright and went in for another rep.

She knew she would only make it to the state level in cross country if she were able to stay focused, but in the back of her mind, she could already hear poor Sam complaining about how many times he was stuffed into a locker that day, or how much he had to spend on lunch before the bullies finally stopped flipping his tray over.

She was settled on her scholarship, and heading off to college next year...but her boyfriend, even as a senior in high school, was preoccupied with getting the assaults to stop.

"You're working late tonight."

Of course, the liberation of turning 18 and looking forward to college meant that Susie wasn't quite as occupied with her classwork; she had an easy load for the final year of her high school career, and she was in the school gym so late, it often took the call of the janitor for her to realize that it was time for her to head home and do something else with her night.

"Gotta shave a few more seconds off of my mile time if I'm gonna impress at the next level," Susie claimed. "Besides, I don't have any homework...if I go home right now, I'll just veg out in front of the TV and put all sabotage my progress with a bunch of empty calories."

"I don't think I've ever met a girl who was more concerned with her weight for the right reasons," the janitor replied. "Or more concerned with her boyfriend, for that matter."

Susie placed the weights back in the dumbbell rack and tried to hide a frown. "Did you catch him getting picked on again?"

"Yeah. He's still in there, honestly," he admitted. "I don't think he has the gall to show his face in the hallway right now, even though we're the only people here."

"I just don't get why they're going after him. Feels like it's only him...and lately, he won't even tell me what they've been doing to him. I'm worried that it's getting even worse."

"You know how dogs can be," the janitor reminded her. "Those Doberman boys can't help being a little territorial...still, I've been reporting what I've seen to the administration, but if they don't think it's a big enough deal to intervene, there's nothing else I can do, Susie."

She smiled inwardly at that. "At least you're trying to help him, Mr. J. I wish someone with a little more authority would take it seriously."

"Maybe you could make it stop, yourself?"

"I know I'm in good shape and all, but those canines...they're huge ," Susie gave a quick shake of the head as she contemplated rumbling with them. "There's no way I'd be able to take one down, and I know that talking wouldn't do any good...they're stubborn as mules."

"You could always even the playing field..."

Susie thought she knew the janitor well enough to trust him, but that didn't stop her from feeling uneasy when he pulled a long, thin can of unmarked fluid from his interior pocket. "I'm not really in the mood to throw away my entire collegiate career for a quick steroid boost, Mr. J."

"You really think I'd give steroids to a kid? I'd get fired so fast, even you'd have trouble keeping up with me," he joked. He set the can on a ledge near the doorway of the school gym, and with a curious stare, Susie moved a little closer. "Trust me, this is safe to drink...and it might even put a stop to all those horrible things they're doing to your boy."

She was every bit as suspicious as one would expect, but as she lifted the can in her paw, she didn't see any change in the janitor's expression.

There have to be at least a few other people in the school, still. He wouldn't give this to me where the security cameras can see if it were anything dangerous, but...what the hell is it?

"Don't really know how this is gonna help, but I could always use a refresher after leg day," Susie admitted. "Thanks, I guess?"

"Just trust me," he repeated. "You want something that'll put a stop to all of this? That's your best bet. You run on home now so I can finish cleaning up in here, okay?"

Offering a small, friendly wave, Susie took the can into the hallway, walking on quiet, timid hooves as she did. "Thanks again, Mr. J."

Even if I still don't get it, she thought. I really wanna help Sam, but what the hell is a sports drink gonna do?

She popped the top and listened to the satisfying fsssssh of carbonation spilling from under her thumb. The sound lulled her into a false sense of comfort as she brought the mouth to her lips, and just at a first taste, she found it had the same forced, overtly sugary flavor of any other cheap energy drink.

Walking down the hallway toward the girl's locker room, she took another sip, and immediately felt a tremor in her chest.

That isn't right. I've never had a reaction to this kind of thing before...

Susie didn't want to stir up a panic, but she couldn't help clutching her chest and holding herself, just below her collarbone. Through the slim fabric of her tank top, she felt another tremor, and a booming pulse of energy in her flesh as her chest bulged up and forward.

Even before she dropped to her knees, she felt new, powerful weight in her thighs and calves; a massive paw stopped her face from ever reaching the ground, but what happened next, she didn't properly remember...

**

This is awesome...I feel like I could rend steel with these fingers...

The Doberman that had been torturing Sam wasn't done with him that day, even after a warning from the janitor. Despite being a student, he was still a legal adult, and the hulking strength hidden in his flesh made him a legitimate threat, even to the members of the faculty that dared to get in his way.

For the first time ever, in that moment, he found himself being taken down not from the outside, but from the inside.

This is definitely the guy, Susie thought. How did I get into his body, though? How can I see what he sees?

It might have looked weird to Sam when his bully started clenching and unclenching his fists, but Susie wanted to make sure that she wasn't imagining what she was seeing. The new height she'd gained was disorienting, and the fact that she was suddenly in a completely new body would take more than a little adjustment, but she'd taken control of his mind right in the middle of the action...and what she saw, she didn't think could be any kind of accident.

She believed that Sam was getting bullied. She believed that some of it wasn't his choice...but when she saw the rope around his ankles and wrists, keeping everything tightly tied behind his back, she had to wonder how much of a fight he was really putting up.

Wait, I...I'm pissing. What the fuck?

A new body meant new sensations, and Susie was being given a trial by fire with her new cock as she bathed her boyfriend with it. She'd taken over the Doberman right in the middle of a truly humiliating act, but Sam couldn't manage a complaint with a used jockstrap stuffed into his maw.

He was just barely looking up as golden juices trickled over the top of his head and spilled down over his mane and muzzle, leaving him a terrible mess...and one that Susie was enjoying gazing upon.

Can't let him know it's me, she thought. What would this guy do...what would he say right now?

"D...Drink up, you little bitch..."

She was winging it from the start, but her voice was so thick and deep that the body she possessed gulped in response to its own words. Sam treated it as a demonstration of what he was supposed to do, but that didn't stop Susie from feeling silly about it as she kept her muscles relaxed.

Peeing wasn't exactly the same in a male form, but she was in tune with her own torso enough to know where the muscles were with a quick flex, and learning to relax her new bladder left Sam dripping with a golden blessing as she finished unloading herself upon him.

His eyes _should_have been filled with some other emotion than the one that she saw, but it wasn't just the hints of lust that were rolling around in his hazel orbs that set her off. She could see him starting to tent through his wet, soaked shorts, and having thought she was the only one playing with that erection before, she became terribly possessive in that moment.

With a new body and new power to put to use, she decided immediately that some sort of punishment was in order; what was being done to him could hardly be considered bullying, if he was such a willing participant.

"Bet you wish you could have gotten more of it in your mouth," she said. She still wasn't used to the heavy bass of her own voice, but she loved the way it snapped Sam to attention anytime she used it. "Too bad you have my strap in your mouth...if you weren't such a greedy little slut, you might have gotten to enjoy both of them..."

A much stronger sense of smell left Susie more familiar with the scent of the Doberman than she ever wanted to be: it was radiating from the jockstrap. She was trying to accept it as her scent, and while she struggled, the new sensation of overwhelming testosterone in her body was starting to corrupt a shared mind...leaving her more concerned with teaching the boy a pleasurable lesson than embracing her own aroma.

The combination of power and lust that existed inside of the young man were fighting back against her sense of mental control, and adept as her cervine body was, she wasn't prepared for just how powerful the arousal of a canine lust could be.

"I'm sorry; I know you can hear me. When I address you, you'd damn well better reply," she ordered him, and again, she saw fear popping up in his eyes, only to have it washed over with a glaze of heightened desire. "I don't care if there's something in your mouth: you either nod or shake your head when I address you."

Sam was obedient enough to Susie in her smaller, slimmer body that it didn't surprise her to watch his head nodding rapidly. He was responding with such vigor that she would have mistaken it for panic, if there was any real sense of danger.

Just seeing how hard Sam's cock throbbed against the cover of his boxers, she gathered that this wasn't the first time he'd been tied down like this; she was learning more about her boyfriend than she ever imagined she would at such a young age.

"Now, I could just leave you here like this, but seeing you all covered in my mess is giving me another problem to deal with," Susie explained. She rested a full, thick paw on the base of her sack and stroked it; her lack of familiarity with the body caused its legs to buckle as she felt a jolt of quick, sharp pleasure, quite unlike anything she'd ever known before. "But I'm not going anywhere until you get the other mess out of me."

For adjusting to the new body on the fly, Susie was doing an admirable job, but it was her adjustment to the Doberman's aggressive personality that truly deserved applause. She couldn't give away any hints that she was in control of him, but she'd only heard so many things from him in passing, and never talked with him at length.

She was doing so well that Sam didn't suspect a thing: the equine was convinced that his bully was just being especially cruel that evening before sending him home to lie to Susie about what he'd done.

"You wanna suck it, don't you?"

The first erection she'd ever known was a startling experience for Susie, from the very first inches of her canine length emerging from her sheath, down to the very tip of the warm, red length throbbing with lewd intentions. She could feel her own heartbeat through every inch as vital essence rushed to the emerging rod, setting the nerve endings ablaze and leaving her to gasp at the sheer girth of it.

She'd had plenty of fun sucking Sam's cock when the opportunity arose, but she couldn't help a brief fantasy of sucking her own, now that she was watching it throb against her boyfriend's forehead.

"Well?"

Sam was more bashful than Susie by a long shot, and even with a powerful Doberman standing over him, it took a moment before he could find the gumption to nod his head, even slightly. The subtle rub of his soaked fur against the underside of Susie's length gave her another deep, riveting tremor of delight, but she refused to let anything get in the way of her already remarkable performance.

She wanted to keep Sam blissfully unaware of what she was up to.

"That's what I thought," she replied sternly. She tugged the jockstrap out of his maw with a firm pull, and as it dangled in her digits, she felt his saliva dripping down to the floor, after soaking her paw. "Now say it out loud, boy..."

"I...w-wanna suck it..."

"Louder."

Sam gulped. "I wanna suck your cock," he said again, trying to sound more confident in that fact.

"Even though you've got a little girlfriend?"

Susie worried that she might have been giving away more of her hand than she should have, but even that little clue wouldn't be enough for Sam to put two and two together.

He was too busy rubbing his cheek against the side of the heavy, canine length and wondering if he'd ever get permission to glide his tongue over the warm, smooth flesh that he so desired.

"Yes," he finally whispered. "Even though I...I've got a g-girlfriend."

It was cathartic for Susie to hear him struggle so mightily with those words, but it didn't change the fact that he'd been lying to her about the kind of bullying he'd received, not to mention his willingness to some degree.

She wouldn't be satisfied with stopping his punishment there.

"Maybe I'll go see what she's up to when I'm done with you...show her what it's like to be fucked by a real man," Susie threatened. She obviously couldn't send that body after herself, but the fantasy was still crossing her mind as she grabbed Sam by the side of his face and pushed a thick, invasive finger into the side of his mouth, prying it open. "She's a tiny thing though, isn't she? You'd better lube me up, just to be safe..."

Sam had no way of knowing that Susie's threat was empty; he took it at face value, and even resisted for the first time, as he tried to keep his lips shut.

His defiance was as brief as it was useless, and a second finger joining the first was all it took to pin his tongue flat against the bottom of his mouth, and open a large enough gap for a canine tip to ease into.

"You'd just let anyone pull your mouth open and stuff their cock right in, wouldn't you?" Susie asked. She approved just how easy he made it for her to glide the tip of her new length over his lips, but the truest part of her still wanted this to mean something. "You only fight back a little because you like pretending you have standards..."

The truest part of her, of course, was powerless against the onslaught of ferocious hormones in the body she'd taken. At her heart, she was still Susie, but in body, she was a tall, domineering canine that was without peer in physical strength, and the horse kneeling before her was hardly a worthy obstacle.

Even though she was thinking about her own boyfriend, she saw him as little more than a roadblock on the way to her next conquest; a place to leave a load so that her full, thick orbs wouldn't be so difficult to walk around.

"Nothing to say to defend yourself this time? Not even gonna try to acknowledge it?" she taunted him as every inch of her member passed through his lips and slipped over his tongue, until the tapered tip of her canine flesh was tickling the back of his throat and forcing him to cough. "Well, you're not good for much, but at least your parents raised you not to talk with your mouth full..."

Even if Sam were able to form words around the canine treat, he wouldn't have bothered with anything more than a moan of praise for what he'd been given. Precum was starting to ooze through his shorts at his shameless enjoyment of the so-called trap, and with no risk of being caught in the act, he could fully immerse himself in the fantasy that he'd been living out, over and over again.

He didn't have any idea how close he really was to Susie right then, as he silently worried about what she'd do if she ever found out his little secret.

"The hell are you gagging for? Don't tell me that's all you can take," Susie offered another taunt, but she added injury to the insult as she grabbed the back of her boyfriend's head and forced him to stay in place, even as he coughed and choked on the tip of the impressive rod. "With such a long mouth...I didn't think you'd struggle at all, but here you are, whining like a little bitch over a few inches..."

Susie wasn't giving the body that she'd stolen enough credit: the Doberman was plenty well hung, such that even she would have struggled with it...and she was used to taking a horse cock in her throat. She might have had an easier time with the canine than her boyfriend was, but she likely wouldn't ever know if that was the case.

She was happy observing his struggles, however, as a final cough left spittle all over her inner thighs, dotting her sack with long, messy strands of saliva.

"Hmmph. So eager to get your face fucked in the locker room, and then when I try to go all out, you make such a mess that I need another shower," Susie chastised his efforts and yanked most of her cock free; she'd learned very quickly that the most sensitive part of her new flesh was the tip, and with no idea how a male orgasm worked, she focused her efforts there, forcing Sam to put his tongue to proper use. "Guess I should return the favor, then..."

Hearing those words, Sam perked his short, sharp ears and immediately swirled his tongue over the tip of the offered rod, hoping that he'd be rewarded with an instant gush of seed.

It was going to take more effort than that, but seeing how quickly he gave himself up to that fate, Susie couldn't help chuckling. "Knew you were a desperate little cum slut," she muttered, but the words became harder to force as new, stronger pleasure moved up from her crotch, right through the middle of her torso. For the first time ever, she felt a clench of tight, tender flesh around a pair of swollen balls, and her mind raced as she tried to keep up.

She'd never forget her first male orgasm, whether it was the sensations that she tried to comprehend, or the image that they left behind on her submissive boyfriend.

"Keep licking...y-yeah...don't you fucking stop, Sam!" she gasped aloud, calling the horse by his real name for the first time and revealing a final hint at her true identity.

Sam never would have picked up on that clue, as a streak of warm, thick cum poured over the back of his tongue in an aggressive shot. The pink of his flesh was bathed in white as Susie jabbed forward, her hips moving on their own and forcing the whole of her length into his mouth once more.

She'd never imagined that a body could do so much without her control, but the orgasm was taking away more than the control over her voluntary actions: she could feel her hold on the doberman's body slipping, too, and it proved to be the only dark spot in an otherwise glimmering moment of physical bliss.

"Oh, r-right...I need to give you a r-reason to show again," she said. Her lips trembled as she forced the words out, and her eyes winced shut as wet, sloppy juices slicked back over her flesh. She pulled it free and made a terrible mess just in doing so, but the fresh, warm gush of seed that oozed over Sam's forehead and soaked his cheeks was just what she'd been going for; she never would have guessed how sensual it would look.

Getting to see it in person, and the utter lust in his eyes as her seed dripped around them, was a memory that she'd carry all the way home with her that night...and one that would leave her needing new sheets in the morning.

"I'm sure you already know this, but...don't go spreading our little secret around," Susie ordered him. She could feel her last ounce of control fading from the canine body as she forced it to walk, regrettably, toward the door of the locker room. "I'd hate to think of what might happen if we got caught..."

**

It took a few days for Susie to process everything that happened between her and Sam, and as was always the case, she did her best thinking in the gym.

That she was masturbating in the shower just a few days later with the memories of what had happened meant that she wasn't as mad as she thought she'd be, but on some level, she still felt betrayed. It wasn't enough that she'd leave him over the act- she thought some of it might have been a genuinely non-consensual encounter- but there was no denying that he enjoyed it before all was said and done.

It was the fact that he kept something from her that deserved punishment most of all, and that weekend, with her parents out of town, she invited him to stay the night. He didn't dare to pass up the opportunity, or the night of passion that followed, but it was Saturday morning that things took an unexpected turn for the unfaithful equine.

"Good morning, Sam. That was quite a performance you put on last night...I'm not surprised that you're so tired, still."

Susie greeted him with a kiss on the side of his muzzle, as she did every morning they were together. When he went to take one from her lips, however, he noticed his mouth was already open...and stuck that way.

He tried to lift his head, but he could only move so far, and tired, flickering eyes quickly gathered that the fuzzy looking stripes of brown in his vision were actually ropes, tied to each of the corners of his bed.

Straddling his chest and showing off her nude form to her boyfriend once more, Susie had a look in her eye that was so eerily similar to the one Sam's bully held, he couldn't help gasping around the plastic toy in his maw.

"Since you had such a good time letting a bully do this to you...I hope you don't mind that I wanted to give it a try."

He could already feel a warmth greater than her natural arousal seeping over his chest, and he recognized the scent that came with it.

He didn't know where Susie had gotten her information, but he was sure that he was in for quite a difficult weekend...