It had been a very short adjustment to her new role in the relationship. Darcy received a LOT of positive reinforcement that helped her settle in to her place, and she quickly discovered that when she was punished for resisting, well, she’d never admit it but she enjoyed that even more than all the treats and orgasms she got for being a good little baby girl for her partners.

But still, there were things she missed, and definitely things she still resented in the new dynamic.

“Where’s your mommy?” Jason asked her.

Darcy glowered at him. It had taken her all of two weeks to get over the initial awkwardness of referring to him as her Daddy, but Holly was a different story. Holly referred to herself as her Mommy at times when things were getting hot and heavy, and Darcy herself had been coerced into calling the third in their throuple Mommy in the heat of the moment on more than one occasion. But having Jason call her her Mommy, that solidified both Holly’s and Darcy’s place in a paradigm that she wasn’t totally comfortable with. It had been Holly who had first put her in this position, quite forcefully, and she was the more dominant of the two women, but she didn’t want to always be the bottom rung on the ladder of her own relationship.

“Don’t be like that,” Jason said, patting her padded bum with a crinkle, and then, without asking, he checked her diaper. No matter how many times he did that, it still always made her blush, doubly so when he found her wet.

“I don’t know…” she said coyly, fluttering her eyelashes. He could always tell when she was lying, but he could be distracted if he thought she was playing a game. Technically, she was.

“Are you sure?” he asked.

“Mmhmm. I haven’t seen her, but she did tell me to stay out of the garage, something about Santa bringing our gift early this year.”

Jason smiled. It would be hard to top last year’s gift, but he was excited to see. “Let’s just take a quick peak, shall we, just to see if she’s home.”

Darcy bobbed her head happily, practically skipping behind him down to the other end of the house.

Jason opened the door to the garage, peering inside. Darcy lingered behind him in the hall, her heart racing.

The sound of metal rattling echoed from the garage, followed by muffled yelling.

Jason turned on the light, illuminating the new addition to the garage. A large metal dog crate was sitting in the center of the floor with a large red bow on top, and a very unhappy looking Holly sitting inside on the beige pillow. She banged her tape wrapped hands against the door of the cage again, glaring daggers at Darcy, who was peering out from behind Jason while he took the scene in.

“What do we have here?” he asked, stepping towards the cage.

“Aeshhnnn!” Holly yelled around the pink silicone bone gag that she was helplessly drooling around.

“Can we keep her, Daddy?” Darcy asked, stepping in front of the cage and staring up at her fiancé, batting her eyelashes. “Please!” she begged, using her baby voice.

She jumped as Holly slammed into the door of the cage so hard it slid on the floor.

“Alright, calm down Holly,” Jason said.

Darcy’s heart raced faster. Holly would ruin her for this if Jason didn’t get on board with it. And she doubted she’d get another opportunity to try again. It had been almost one year since Holly had first stripped her naked, forced her into a diaper and left her bound and gagged under the tree for Jason. There was no doubt in her mind that Holly would try to outdo her gift to Jason this year, and Darcy intended to preempt her by acting first. Unlike Holly, who had easily physically overpowered the smaller girl when she forced her way into her and Jason’s relationship, Darcy had resorted to drugging her friend. A couple of crushed up Ambien in her tea in the morning had worked like magic, and after an hour when Holly had passed out on the couch, Darcy had been able to strip her naked, without Holly even coming close to waking up. Even while Darcy had dragged her out to the garage and forced her into the cage she’d bought at a yard sale and kept hidden for weeks, waiting for the moment, and the courage, to try her coup. By the time she was taping up Holly’s fists into useless mitts, she was confidently taunting the sleeping girl. “You’re going to make such a cute, helpless little puppy!” she bragged as she strapped the bone gag in Holly’s drooling mouth and put the furry brown ears in her hair, relishing as she forced a lubed up plug into the unconscious girl’s tight little butt hole and attached a matching tail.

That bold confidence was gone now that Holly was awake and angry, but she steeled herself, looking up at Jason. “I’ve always wanted a puppy. I’ll be a very good girl,” she promised, clasping her hands together in front of her diaper and squeezing her breasts between her arms, accentuating her cleavage. “I can help take care of her!”

“Where’s the key, baby girl?” he asked.

Jason wasn’t immediately falling for her ploy, but she still had tricks to employ. “I dunno. I don’t have any pockets,” she said, gesturing at her lack of pants, and thrusting her hips forward suggestively.

“Were you a bad baby and put it down here?” Jason wasted no time in reaching down the front of her diaper, finding her very, very wet. Beneath them, Holly fumed into her gag again and shook her cage, but Jason’s focus was on Darcy, and hers was on him as his fingers played with her slick folds. “Do you have the key?” he asked, his fingers penetrating her.

“I—” she gasped sharply, grabbing onto him for support as her legs got weak. He always knew exactly how to touch her.

“Where is it?” he asked, leaning in and whispering in her ear.

“It’s— I’ve—“ she stammered, getting more breathless as he toyed with her needy princess parts.

He stopped suddenly. He’d found the key, tucked into the leak guard against her thigh.

“Wait!” she pleaded desperately, only for him to pop her pacifier into her mouth, shushing her.

“Time out,” he said, pointing to the corner.

Darcy stamped her foot, almost forgetting all about Holly as she slipped easily into brat mode.

“Do you need a spanking?”

She huffed, but she marched over to the corner, crossing her arms across her chest. She stared into the corner he had sent her to until she heard the click of the lock, before she snuck a glance over her shoulder.

Holly was braced to burst out of the cage, poised on her hands and knees, practically shaking with anticipation while Jason slowly undid the latch.

“Wait,” he told her, grabbing the leach clipped to the side of cage. A smile spread behind Darcy’s pacifier. She’d put the leash on Holly while she slept, savoring the feel of holding the dominant woman on a lead, even if she wasn’t conscious to feel what it was like to be on the other end for once. She’d taken it back off, leaving it for Jason, baiting the trap as it were, and just as she’d hoped, he was taking it. Once he clipped that leash on Holly, it would be set. She’d be the dog, the naughty puppy that needed to be trained and broken in.

“Come here,” Jason said, patting his thigh coaxingly as he held out the leash. Darcy could see it in Holly’s eyes, the internal struggle as she weighed her options. She could fight, just like Darcy herself had done a year ago, struggle against her restraints and demand to be released through her gag. She could try to safeword, and hope that Jason honored it immediately, knowing that she hadn’t offered the same luxury to Darcy that first time. Or she could submit. Crawl on her hands and knees out of her new cage, head bowed, and allow her master to clip the leash on her collar. Holly knew as well as Darcy did that obedience was rewarded in this house.

“Come here, girl,” Jason said. It wasn’t the same tone he used with Darcy, the voice that made it clear he was talking to a child, a baby. It was close, but subtly different enough. It was his voice he used when talking to animals. When talking to a dog.

Holly’s eyes flicked to where Darcy was stealing a glance over her shoulder from where she stood in timeout. The glare made it clear that Holly would make her pay for this when she got the chance. Darcy let her pacifier fall from between her lips and stuck her tongue out at her before swiftly putting her paci back in. She’d spent nearly a full year as the baby in their relationship. Once Holly cemented herself as the dog, it wouldn’t matter.

Ducking through the door, Holly crawled out of the cage. There was no way to gracefully exit a cage, especially with one’s ankles taped to their thighs, but Holly tried. The brown furry tail dangling from the butt plug Darcy had forced into her while she was unconscious swished back and forth behind her while she crawled out. She sat back on her haunches, her breasts jutting out between her forearms as she looked up at Jason.

“Good girl,” he praised her. Behind him, Darcy had given up any pretense of staying in timeout. She’d turned around and was watching the scene unfold with unbridled glee, the faint crinkle of her diaper as she rubbed herself audible above the sound of Holly’s heavy breathing around the bone gag.

Holly had plenty of time to consider her predicament, waking up feeling like she had the worst hangover, naked, plugged, collared, gagged, bound and locked in a cage. She’d grown complacent. For the first month or so after Holly had joined their relationship, Darcy had occasionally tried to reassert her dominance. Each time Holly swiftly put the girl back in her place, spanking her until she cried and then tying her up and forcing her to cum over and over until she thanked Holly for putting her in diapers. It worked like a charm on the natural submissive, and overtime the attempts to adjust the imbalance of power had waned to the point where Holly assumed Darcy had fully accepted her place, and was grateful to Holly for introducing her to her new lifestyle.

She may have accepted her place, as she stood behind her fiancé who she now exclusively called her daddy, perfectly comfortable wearing just a diaper and tight fitting Care Bears T-shirt, sucking on a pacifier. But she hadn’t forgiven Holly, apparently.

The leash got closer, the shiny chrome clip between her boyfriend’s fingers glinting in the dull light of the single bulb illuminating the garage. If this was just Jason, if he was the one who’d decided that she was going to play puppy, she’d have eagerly leaned forward, lifting her chin for him to attach the leash to her collar. She’d played his kinky mistress, the lazy maid, the careless babysitter, the slutty cheerleader. She probably would have submitted to being his little puppy girl, to be dehumanized, had it been just for him. But she couldn’t ignore Darcy’s smug smile behind her pacifier, and she jerked back at the last moment, away from the leash, and swatted his hand away with her tape covered fist, growling garbled nonsense behind her gag. When she got free, she’d give Darcy the spanking of her life and then leave her tied up in the very cage she’d put Holly into, with the same tail hooked to her buttplug poking through a hole in her diaper.

“Bad dog!” Jason said, his voice suddenly stern. In a flash he had grabbed her collar, the black leather digging into her neck as his fingers wrapped around it. Holly recognized it immediately, that dominant appetite she’d helped foster in him. A shiver of excitement ran down her spine as he dragged her across the cold, smooth cement. The smooth tape encasing her hands provided no traction, and she quickly learned trying to dig her knees in was a mistake as he pulled her to the side of the room and grabbed a magazine off the supply shelf. “You don’t try and hit your master,” he said, rolling the magazine into a tube.

Holly shivered as he called himself her “Master.” Her eyes were glued to the magazine held coiled in his strong hands. It was a thick one, an old issue of National Geographic. It would hurt.

He shoved her face down until her nose pressed against the cold concrete. Holly’s ass was thrust out into the air, a vulnerable, perfect target. The fur of her tail tickled her back as he flipped it up, getting it out of the way.

“Bad dog.”

WHAP

Even bracing for it, Holly was unprepared for just how much the rolled up magazine stung when it connected with her ass, planted evenly across each cheek. She yelped into her gag, instinctually trying to reach back to her stinging buttocks, but Jason’s grip on her collar tightened and he held her down.

WHAP

Her teeth dug into the bone wedged between her teeth, spittle flying out and landing on the floor in front of her face as she cried out. She was intimately familiar with his hand on her backside, but the rolled up magazine was something else. Maybe it was the collar and gag, maybe it was the way he was calling her a bad dog while he smacked her, but she arched her back, thrusting her butt up higher, savoring that sting of the strikes, the way the heat emanated from the point of impact, to between her legs, radiating to her core.

WHAP

“You’re going to be a good dog.”

It wasn’t a request, or even a demand. It was an expectation. She was going to be a good dog for him. For both of them.

WHAP

Holly looked up at him. “Ephh aaafffpprrrr!” she tried to agree through her gag.

WHAP

“Dogs don’t speak.”

WHAP

She knew what she had to do, what was expected of her. She barked. “Arrfff!” she yipped, the bone wedged between her teeth facilitating the animalistic noise where it had inhibited her human words. “Arrrrrrfffff!!!”

“Good dog.” He didn’t swing the rolled up magazine again, instead gently caressing her tender backside. “There’s a good dog.”

She barked for him again. His touch felt so good against her inflamed skin.

“It’s okay,” he said, his voice reassuring. “You didn’t know any better. You just need to be trained.”

She’d used those lines on Darcy so many times, teasing the submissive girl whenever she used her diapers. Turns out, it had quite the effect on her too. She was sopping wet for him when his fingers finally found their way between her spread legs.

“Oh, you’re in heat.” He pushed two fingers inside her. “Is that why you’re acting up? Are you a needy little bitch in heat?”

“AAAARRRRFFFFF!!!” she barked, rolling her hips as she desperately pushed back on his fingers, needing him deeper inside her.

“Baby girl, if you can’t stop playing with your diaper, I’m going to put you in your mittens.”

Darcy froze, both hands pressed deep into the padding over her princess parts. She’d been so enraptured in watching Holly’s transformation, she hadn’t been able to help herself. She’d never in her wildest dreams imagined that it would not only go so well, but that she’d find it so hot. Watching the girl who had put her diapers reduced to a barking, horny dog was hitting all kinds of buttons for the little girl.

“Come here baby girl.” He beckoned her closer. Holly watched her apprehensively, breathing heavily around her gag, her chest heaving, her whole body almost quivering with carnal lust.

Darcy waddled closer, using every ounce of self control she had to not touch her diaper, as each step made the wet padding rub against her. “Yeth, daddy?”

He took the pacifier from between her lips and kissed her. “A puppy is a lot of responsibility.”

She nodded vigorously. “I know, daddy.”

“You’re going to have to help take care of her.”

Holly understood. All the times she or Jason had pacified Darcy, telling her “the grown ups are talking,” while they talked about her as if she had no say in the matters, she got it now. It was deeply humiliating, demeaning and dehumanizing her. It was also a huge turn on. Having the girl whose diaper she had changed this morning assure her master that she would take Holly for walks and feed her and make sure her water bowl was full had Holly’s heart racing with desire.

“I can help, Daddy! I’m old enough!”

“I know you are, baby girl.” He kissed her again and patted her diaper, making her moan. Jason turned back to Holly, who looked ready to jump up and start humping his leg like an actual dog. He grabbed the leash again, opening and closing the clasp as he brought it closer to her. “Are you going to be a good dog for Darcy?”

Not baby girl, not little one, not princess piddles, not Dar Dar, not any of the dozens of nicknames they used to help keep her in her place. She may have still been wearing a diaper, but the use of her adult name cemented the shift in power dynamic.

“Aarrrfff!”

“Good dog.” He clipped the leash to her collar, and then handed the leash to Darcy. “I’ll be right back. You girls play nice.”

“We will, daddy.” She looked down at Holly, slowly wrapping the leash around her fist while Jason left them alone in the garage. When he door shut behind him, Darcy squatted down so her face was closer to Holly’s. “I did this to you.” The childish affectation in her voice was gone. Holly tried to scuttle back in surprise, but Darcy tightened her grip on the leash, controlling her. “I love you Holly, I really do. I’m glad you’re with us. I don’t mind that you’re fucking my fiancé. I like when you’re fucking me. I don’t even mind the diapers. I’ve grown quite fond of them, actually.” She started to rub her diaper, crinkling the plastic as she played with her aching princess parts. “But Jason is still my fiancé. I know you think it’s a fun joke to tell me that he’d much rather get married to you and not a diaper dependent little baby like me. You might enjoy the idea of putting me in a cute little dress that shows off my diapers and making me be the flower girl at my own wedding.”

Holly was trembling. There were many reasons Darcy and Jason’s wedding plans had been put on hiatus, navigating the logistics of their relationship now that it included a third being a big one. But Darcy was still wearing that engagement ring. The diamond sparkled as her fingers worked, kneading the soggy padding of her diaper.

“Not that it’s a competition between us, but if it were, do you think he’d rather marry me, or the dog?” She wrapped her fist around the leash again and again until her hand was against Holly’s collared throat. “Maybe you can be the ring bearer. Have the rings dangle from your collar, right here, and you can crawl down the aisle on all fours to bring them to us on our special day.”

Holly had underestimated Darcy. The fact that Darcy was wearing his ring and she wasn’t did bother her. That jealousy would only get worse after the wedding, and she had taken a certain delight in tormenting Darcy about her indefinitely delayed marriage. It seemed she’d struck a nerve, and was about to pay for it.

“You’ll need lots of training,” Darcy continued. “You’ll come to enjoy it. You can be trained to like just about anything.” She rubbed her diaper for emphasis. “Especially an impressionable little pup like you.” Darcy leaned in closer, putting her lips to Holly’s ear and reaching down between her legs, feeling her wet snatch. “Positive reinforcement works wonders. There’s a reason Pavlov worked with dogs.”

Jesus fuck. Holly jerked her hips, thrusting into Darcy’s hand. How was this working on her so fucking well? She was just so desperate.

“I’ve been a good baby for you all year,” Holly whispered. “Now you’re going to be a good little bitch for me.”

“Urrfff!” A high pitch bark escaped Holly’s lips. She was humping Darcy’s hand, trying to get just a little more out of her friend’s teasing fingers.

“That’s right. You’re—” she stopped suddenly, pulling her hand away. Holly spread her legs wider, desperately trying to hump the cold concrete floor. “Daddy!” Darcy cried, her childish voice back. Jason had just opened the garage door. “I was just telling her how much fun we’re gonna have togever!”

“I’ll bet you were, baby girl.” He walked over, taking a gift bag out from behind his back.

“Oh! What’s this?” Darcy danced excitedly, reaching for it. Holly coughed as Darcy let go of her leash, and she shrunk back, wondering where Jason stood on her level of torment.

“Open it. It’ll help you establish a bond with your new puppy.”

Darcy snatched from him, turning back to her puppy, a devilish smile across her face. Her grin only widened as she reached her hand inside. “What’s this?” she asked rhetorically. Holly could only watch, frozen in place. Slowly Darcy pulled out the long, rubbery black phallus, pulling the mass of black straps out with it. Darcy recognized it. A strap on. Her strap on, specifically. She had used it many a time to fuck her helpless little diaper slave. Now Darcy was trying to fit the thing on over her diaper.

“Daddy! Help!”

“Of course, sweet heart.” He was quick to step in and help adjust and fasten the harness over her bulky diaper. He looked down at Holly while he worked, smiling at her. He absolutely knew what he was doing. He’d sat back and watched her while she bullied his fiancé into diapers. He taken her into his bed, had his way with her, enjoyed watching while she’d had her way with Darcy. But now it was time to put Holly in her place.

“There you go, baby girl.” He smacked her padded butt playfully. On the front, the dildo jiggled ominously. Darcy grabbed it, rubbing copious amounts of lube onto the shaft until it was dripping with viscous, white fluid.

“Are you ready, puppy?” Darcy asked.

Holly gulped. “Arrrffff,” she barked, leaning forward, her butt up in the air. She felt Darcy grab her hips and the tip of the dildo entered her slick folds. Holly arched her back and pushed back, forcing Darcy deeper.

“Bark for me, puppy,” Darcy commanded.

“Ruurrfff!  Arrrrfff!” Holly cried.

“Good dog,” her new mistress praised her, grabbing her tail, wiggling the plug inside her as she rhythmically thrusting her hips forward. She drove deeper until her diaper pressed against Holly’s ass.

“Aaarrrffff! Uuurrfff!” Holly barked. She deserved this. She needed this.

“You’re going to be my perfect little puppy, aren’t you?”

“RUUURRRRFFFF!” Holly howled. She could be Darcy and Jason’s good little puppy. She could handle that. She hadn’t enacted her own plan for Christmas yet, but maybe it could wait. Darcy could enjoy her time on top. There was always next year.