Kelsey stopped short as she approached the invisible barrier that kept her caged. Her arms and legs refused to obey her attempts to get them to make the last few steps to cross the fence. The memory of far, far too many shocks from her collar had been buried deep in her subconscious and instinctually paralyzed her to prevent further suffering.

Kelsey grit her teeth around her bone gag, willing herself to move. Slowly, her left hand lifted off the ground, her fist encased in a PVC paw that made her fingers useless. Kelsey willed it to move over the threshold, her whole body tensed to flinch, but the shock didn’t come as her paw landed on the grass on the other side of the invisible fence. Not yet, the collar around her neck still inches from danger.

It was getting harder and harder. She was tired of the pain, exhausted of being hurt. Shutting her eyes, the unwilling pet leaned her head forward.

Searing pain shot through her body from the two metal prongs digging into her throat. She bit harder into her gag to stifle a scream and lurched back, back to the safety of the yard. The jolt stopped as suddenly as it hard started, and in reality, it had only lasted a second, but it felt like an eternity.

It wasn’t long enough. Kelsey put both front paws on the other side of the threshold and forced her back legs to follow, walking on her knees until she pushed her neck back over that line, lighting up her whole body with agony once more. She held herself there, forcing herself to stay, fighting every fiber of her being that wanted nothing more than just retreat to the safety of her prison, but Kelsey refused to yield. She forced herself to count, making her screaming brain focus on something other than the pain.

One.

Two.

She couldn’t do this.

Four.

Five.

It wasn’t getting better.

Seven.

Eight.

It was never going to get better.

Ten.

Eleven.

With a yelp, Kelsey fell to her side back in the yard, her limbs still twitching long after the electricity coursing through her body subsided.

Eleven seconds. Double digits, at least, but how long before she couldn’t keep it up that long? Her times were getting shorter, her tolerance diminishing, her will crumbling.

“Kelsey!”

It was her voice. Better to be caught electrocuting herself by her instead of him, but Brook shouldn’t be using her name. That was liable to attract his attention.

Kelsey struggled to get her limbs under her as she got back up on all fours. Brook was running towards her, her face full of concern. “What are you doing? You know you’re not allowed out of the yard!”

Kelsey looked past her former roommate at the house. There was no sign of him.

“Come on, back inside pup. You’ve been out long enough.”

Kelsey didn’t move. Her body ached, and she was tired. This time didn’t have the will to make her aching limbs move. Not for her.

“Do I need to go get your leash?”

Kelsey stared up at her. Let her get the damn leash. She could drag her all the way back. She tried to think practically; what would that accomplish? But she didn’t care.

“Come on,” Brook pleaded. Still Kelsey couldn’t bring herself to move for her.

“Now!” Brook said sternly. The tone was odd coming from her, an alien language coming out of the sweet girl’s mouth.

Kelsey’s eyes narrowed, and she felt a low growl rumble from deep in her throat. Brook reached for her and Kelsey swiped at her hand, suddenly finding the energy. Brook recoiled, rubbing the back of her hand. Kelsey’s rubber encased mitt hadn’t done any real damage, but Brook acted like she’d been burned.

“Kelsey! Please!” Brook whispered, her lips quavering. She looked like she was going to cry.

The girl on all fours settled back on her haunches, lowering her hackles, the snarl on her face relaxing. Kelsey lowered her head submissively and took a couple steps forward, ignoring the pain in her joints, the oh-so-wonderful side effects of repeated electrocution.

“Thank you,” Brook whispered, so quietly that Kelsey almost couldn’t hear her. She wished she couldn’t. Brook’s gratitude was worthless to her. She followed the unbound girl back to the house, watching the backs of her legs, trying not to envy the simple pleasure of walking on two legs. Like a human. Kelsey expected Brook to lead her straight to her kennel, but she turned, heading to the living room. Her dog bed in the living room was moderately more comfortable than the thin pad on the bottom of her crate, but the extra cushion was not worth it. She’d gladly take the solitude of her cage, alone in the dark, than have to be with everyone else. The high-pitched noise of whatever mind rotting cartoons Sara was forced to watch was what she had to look forward to if she was lucky, and if she wasn’t, Sean would be there, talking, touching, taking.

But the living room was empty when the girls arrived and Brook sat down on the couch.

“Come here,” Brook said, patting the cushion next to her.

Kelsey eyed her warily. She wasn’t in the mood for Brook to tediously spell out a coded apology or some other bullshit. Brook raised her eyebrows. It was as close to begging as she would get inside, under such scrutiny. When Sean wasn’t around, Brook was supposed to be in charge, and Kelsey was supposed to be obedient. She was the dog, and Brook her mistress. Sean would settle for nothing less.

Reluctantly, Kelsey clambered up onto the couch. As she tried to lay down next to Brook, her old friend gently hooked a finger under collar. “Come here,” she repeated. Kelsey found herself being lead across Brook’s lap. She hoped the girl just wanted her on the other side of the couch, but Brook pushed her down over her thighs, her palm delicate but forceful on her lower back. “Lie down.”

Kelsey tensed, trying to stand back up, but she couldn’t get purchase on the couch with her knees, and as she tried to push up with her hands, Brook firmly pushed her back down.

“Stay.”

Kelsey tried to turn her head to look up at her mistress, but Brook put her other hand on the back of her head, her fingers scratching her like she would a dog.

“Relax,” she said.

It felt somehow worse when Brook did it than when Sean petted her. She expected it from Sean. She and Brook were supposed to be in this together, sisters in captivity. This felt wrong.

“I know it’s hard,” Brook said as she continued to stroke her. She could feel her fingers, through her hair, over the PVC bitch suit she wore, then over her exposed flesh. “All this punishment, and you just keep trying to make it harder on yourself.”

Over and over, from head to tail, the motion jostling the plug buried deep inside her. Again Kelsey tried to get up, to push herself off of Brook’s lap, but she had no leverage. Her former friend had her trapped, easily pinned in such a vulnerable position. Every time she managed to push herself up an inch, Brook’s hand was right there at the back of her head, gently but forcefully pushing her back down before running down the length of her back, over her butt, and along her tail.

“It doesn’t have to be so hard,” Brook continued. “You don’t have to be punished all the time.”

Kelsey could feel her other hand, her fingers running under her tail, tracing along her inner thighs as she squirmed.

“You don’t have to hurt anymore. Being a good dog can feel good.”

Sean had kidnapped her, stripped her, bound and collared her, shocked her, muzzled her, violated her ass with the miserable plug, but in all that time, he’d never touched her. Not like this. Brook of course had been taken in every way imaginable, and even Sara hadn’t been spared, but as the dog, this had been the one thing that had been beneath him, as though she were an actual dog, and any sexual act would be bestiality, and even a monster like Sean had lines he wouldn’t cross.

“Just relax,” Brook whispered. “I just want you to be a good dog for me.” She spread Kelsey’s thighs, her fingers running along Kelsey’s bare sex. “Good dogs get rewards instead of punishments.” She rubbed Kelsey’s clit with one digit while another gently glided up and down her slit, teasing her. “Isn’t this better than getting shocked?”

She tried to tell herself it wasn’t, even as her body responded. It got harder to keep trying to close her legs to keep out Brook’s invading hand. Kelsey tried to focus on why she was suffering the painful electrocutions as Brook did everything in her considerable power to distract her. She’d stopped trying to get up, using her hands instead to try and bat Brook away, to no avail.

“Be good,” Brook said, pushing her cumbersome paws out of the way with one so she could keep fingering the frustrated puppy girl. “I want you to be happy.”

Kelsey didn’t care that Brook was crying, her voice hitching as she told her to be a good girl, a good dog. She hated Brook, almost as much as she hated her own body for betraying her, her pussy getting wet as her mistress manipulated her.

“Please, just be happy.” Brook plunged her fingers inside Kelsey. “Don’t fight it.” She worked her fingers faster, trying desperately to coax an orgasm out of the unwilling girl. Kelsey could fake it. Just give Brook what she wanted, and get it over with, but she was too stubborn. She thrashed about on her mistress’s lap, determined not to give in, but Brook had the advantage.

“Just be a good dog!” Brook panted through tears. “Take your treat!”

The carnal pleasure that came with the forced orgasm did not equate to happiness. The rage, however, did abate as Kelsey lay quivering over Brook’s lap, growling into her gag, replaced not with happiness, not with shame for what she’d been forced to do, but with something else.

Kelsey had a renewed sense of purpose.

Her bound legs still felt like jelly as Kelsey forced herself up, and this time Brook didn’t try to stop her. Kelsey stood in front of the back door, staring fixedly at it until she heard Brook get up and follow her. Her former friend didn’t touch her, didn’t speak to her, she just opened the door for her and let her out into the yard. Sean would be watching now, for sure, but she didn’t care. Kelsey walked straight for the edge of the lawn, right to the invisible fence. This time her body didn’t slow, the memory of the pain pushed out by a fresher memory, one that gave her the push she needed. Electricity coursed through her body, but she didn’t care. She embraced it. Kelsey could take it. After what Brook had just done to her, Kelsey could take anything.

Standing on the other side of the fence, taking the pain, Kelsey began to count.