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Harry finds the dog in the second week of July or maybe the dog finds her, she's not sure how it happens. It is late and she is in the park and suddenly there is a huge dog sniffing at her feet, tail wagging. She freezes in fear: she's never seen one this large before, didn't think it was even possible, the dog standing tall and broad in front of her. He sniffs his way up between her legs, pushing his nose firmly against her pelvis, and she giggles nervously."Down boy," she says softly.Boy, because there is no mistaking that thing.She isn't very authoritative, far too hesitant for the dog to know he should listen to her, and she tries to distract him by petting him, but it doesn’t work, he keeps nosing her between her legs. Does she smell bad there? What is he doing ? "What do you want?" she exclaims, embarrassed. "Stop that, bad dog."The dog whines and promptly lies down at her feet. Now that she can take a good look at him, she notices that he looks somewhat clean and despite the lack of a collar, and she's not sure he's actually a stray. His fur cut incredibly short, like he recently got a good but very uneven shave, but he feels soft to the touch.Harry spends the next few minutes petting the dog, but it's late already and she has to go back before Aunt Petunia locks up, so she gives him one last pat on the head. "I have to go now or I'll be locked out," she tells him, turning to leave.The dog gets up too.He follows her all the way home. "Oh my god, he's huge!" Dudley shouts. "Mum, look at him!""I'm looking, Dudders," Aunt Petunia says, looking sour."Please, Mum, can we keep him?" he asks."No, the floors—""I'll do the floors every evening before bed," Harry interjects quickly.Dudley nods eagerly. "Hear that, Mum? Harry will take care of it."Aunt Petunia’s lips thin even further as she looks from Harry to her son and back at Harry again, her eyes narrowing. "You will walk him and you will share your food with him. You will bathe him once a week. You will do your own laundry. You will vacuum and mop downstairs twice a day. He will not leave your room.""But Mum, I want—" Dudley begins."No." That night, with the enormous dog wrapped around her securely, she has no nightmares. In the morning, Harry wakes up on her back with a face full of fur, her shirt rolled up to her armpits and her legs spread wide. The dog is lying on top of her between her legs, covering her entirely and trapping her in place. He is moving above her and at first she doesn't understand what's happening, but then he whines and shifts and something hard pushes up against her centre and stays there.Oh.He is humping her, rubbing his cock between her legs. Having seen it last night while she was changing into her sleep shirt, she already knows it's much bigger than she's ever seen on a dog before, but then, the dog is much bigger than she knew was possible. Of course his cock is large too, that only makes sense.Harry is stuck where she is underneath the dog, unable to do anything but lie there as the dog uses her body to get off, and she can't help but squirm in place. What does his cock feel like? She shouldn't touch it, she really shouldn't, it's a dog, but nobody will know if she does, right? Nobody but the dog, and the dog won't care.Slowly she lowers her hand to her belly, the back of her hand bumping into his cock. She curls her fingers around it with undeniable curiosity and it is hot and hard and unlike anything she's ever touched before. The dog whines loudly as she wraps both hands around his thick length, creating a loose tunnel for him to put his cock into, and when he finishes, he does so all over her, his hot dog seed hitting her belly.Suddenly she is deeply ashamed of what she has done and she lets go of his cock and pushes on his chest to get him off of her, but the heavy dog doesn't budge for long moments, still ejaculating. It takes long minutes before it finally stops and only then does he get up. He moves down her body until he's able to lick her face, licking down her throat and then he's licking her nipples, her left first and then the right one. Her breasts are incredibly large for her age, already a C-cup at the age of twelve, and she doesn't like them, but it feels nice to have doggy kisses there. He moves further down her body and then he's pushing his nose between her spread legs and that too feels nice.No, that's bad. He's a dog, it's not normal to have a dog touch her, or to touch a dog for that matter."Come on, get up. We need a shower," Harry says, sitting up and pulling her shirt back down. She's not sure how it managed to roll up so far, she has never had that happen before, but it doesn't really matter, it's just her and the dog. "I need a name for you," she says. She eyes the black dog plushie on her nightstand. She's had it since she was a baby and its name is Paddy the Grim and it's similar enough to the dog that she makes a quick decision. "Your name is Grim," she says.Grim barks in agreement. The dog keeps watch over her while she showers and he is there to stick his nose between her legs again when she gets out of the shower cabin, except this time there is no underwear stopping his cold nose from making contact with her hot centre, and she gasps. His erect dog cock sticking out when he sits down on his hind legs in front of her, wagging his tail. Horribly, she thinks to herself that she wouldn't mind it if he humped her again. It was interesting and even a bit exciting to do something so filthy with an animal. She feels dirty, but she also wants to do it again.Maybe her family is right, she really is a freak.Even though Aunt Petunia insisted that Grim shouldn't leave her room, she says nothing when Harry comes downstairs with Grim in tow. For a second she is afraid that Aunt Petunia will see on her face what she did this morning, that she touched her new dog's cock, but Aunt Petunia ignores her while Harry goes about getting breakfast for both her and Grim.After breakfast, Harry lets Grim out through the front door. "Will you come back?" she asks.Grim barks, licking her face before running off. After Harry's chores are finished, Aunt Petunia makes her come along with grocery shopping so that Harry can carry all the heavy things. They come home with more stuff than usual, but that's also because they got dog food for Grim, because Aunt Petunia said sourly that he can't keep eating human food. Grim is waiting for them when they return and, tail wagging happily, he follows them inside the house.Dudley comes home for dinner and tries to mess with Grim, but quickly loses interest when it turns out Grim is much more interested in Harry, sitting next to her chair and resting his head in her lap and staring up at her adoringly while Harry scratches him. They give him a bowl with premium dog food, because Aunt Petunia can't be seen buying subpar pet food, and he eats while the humans do too.Harry has to take care of the dishes after dinner, but when that's done she has free time. "Do you want to go to the park? Or do you want to stay inside? If you stay inside, you have to let me know when you have to, you know, pee and stuff. You'll have to do it in the bathroom, but I'll clean it up."Grim goes upstairs.It's only eight in the evening and Harry has very little to do to keep herself entertained except homework or going through her textbooks. She really should have bought some other stuff to read, she's not sure why she didn't, but next time she's in Diagon Alley, she's going to have a look at wizarding fiction books. Surely that can't hurt.She takes her favourite children's book off the shelf, something that actually belongs to Dudley but which he never looked at twice, and sits down on her bed, propped up against her pillows. Grim joins her on the bed, staring at her and barking twice, then forcefully pushing his nose into her pelvis until she spreads her legs for him to get comfortable between them. He does so immediately and she sighs.Of course Harry would get a dog who can't leave her privates alone.She touches herself pretty regularly and it always feels nice, but if she's honest, it's even nicer to have Grim between her legs like this. She opens her book but can't focus on the text, instead staring at the illustrations, unable to stop thinking about his cock and how it had felt in her hand. She's never seen a boy's cock before and she knows it looks different, but now she's wondering how that would feel, if it'd be just as hard and heavy as Grim's had been.Logically she knows that one day, if she wants babies, a man is going to put his cock inside her vagina, but her hole is so small that whenever she puts the handle of her brush inside there, it stings for a bit before it starts to feel good, but then it starts to feel really good. She loves having something inside her and the idea of having something really big in there is oddly exciting.Once she tried bringing up masturbation with Hermione, but Hermione had looked so scandalised and embarrassed by the topic of sex that they hadn't spoken for a week afterward. It was a very awkward and uncomfortable week and Harry resolved to never speak of it again, at least not with Hermione. Lavender and Parvati are more like her, open and curious about sex, but she feels almost like she's cheating on Hermione when she talks to them, so she doesn't do it often.Without warning, Harry finds herself turned on.She puts her book down and groans, burying her hands in Grim's fur and leaning over him to kiss the top of his head. "Are you horny too?" she mutters, letting go of him and reaching over to her nightstand, where she keeps her brush. "You're in the way," she says. "I want to get up so I can take my clothes off."Grim shuffles down the bed, sitting up as she does. She gets up from the bed and takes off everything, which isn't that much: just her shirt, her shorts and her knickers. She doesn't have any bras because Aunt Petunia's bras are much too small and the woman refuses to buy her anything, so Harry is used to not wearing anything. She knows her breasts look weird on her, she knows what they say about them behind her back and sometimes in front of her too.She gets under the blanket and immediately Grim is back, lying down on top of her. He doesn't put his weight on her, though, for which she is glad. How is she supposed to do this with a giant dog on top of her?"Grim, get off me for a bit, I can't move," Harry complains.Grim huffs and barks but then does as told, moving away. His tail is wagging and he's watching her with his head tilted to the side, clearly observing her. As she watches him back, she can't help but look at his cock and watches it grow under her gaze, red and thick and so big that this morning she needed two hands to form that tunnel for him to use.What if Grim put it inside her?It would never fit, but the idea is surprisingly arousing.Harry slides her hand under her blanket and feels between her folds, finding herself wet. What if she lets Grim under the blanket with her, so he can smell her better? She's not wearing underwear, but she wasn't wearing that in the bathroom this morning either. Who is going to know what she's doing with him?Nobody, that's who.She lifts the blanket and Grim wastes no time in getting under it, shifting around until he's lying between her legs, his cold nose pressed into her centre. She wonders what his dog mind thinks of the fact that she is wet. Even though he seems very intelligent, almost eerily so, he's still just an animal who knows nothing about these things. She reaches down and rubs her swollen lips for a moment, but then she lowers her other hand holding the brush."You're in the way, Grim," she says.He moves a bit down the bed, enough to pull away from her, and Harry runs the handle of her brush through her wet slit. Then she spreads her legs wider, pulling them up a little as she inserts it into her pussy. It's strange that she can think of her vagina as a pussy but insists a cock is a cock, which she knows is childish, but she's twelve: she is a child.Harry moans softly as she sticks the hair brush in all the way, the handle just long enough to fit comfortably inside her. It stings a little, but it always does, and she starts to move the brush in and out of herself, slowly at first but then harder and faster as it starts to feel better, panting and biting down her moans. She can't keep it up for very long, because every time she starts to feel good, her body locks up and she stops moving, and besides, her arms get tired and heavy, even when she switches hands. Finally she lets go of the brush with a sigh, relaxing back against her pillows and leaving the brush inside her for now.But Grim grabs the brush between his teeth and pulls it out of her, dropping it on the mattress and moving in to lick her centre, making her moan loudly in surprise. His wet tongue pushes against her opening and drags up to her clit, where it lingers before it moves down again. She bites her hand to stifle her moans while her dog licks her between her legs, licking her clean.He doesn't stop for a long time either, driving her wild. She pulls her legs up and wraps her arms around them, pulling on her pussy lips to spread herself wide open for him. He licks her right where she wants him to and he gets her so close she can taste it, but her orgasm doesn't come, staying just out of touch, and she's shaking horribly."I can't come, Grim," she whines softly.Grim doesn't stop immediately but he does slow down, as though he actually understood what she meant, and finally he slows to a stop. Harry lifts the blanket to let in fresh air, knowing it gets stuffy under her old duvet and immediately he noses his way up her body, stopping at her breasts for a moment but then moving further up."Did you like that?" she asks.He barks.Harry smiles. "I liked it too," she whispers. "Do you want to come?"He makes a high whining noise, almost like a question."You can do what you did this morning," she suggests. She shuffles properly underneath him until all she sees is his black fur, and she pulls her legs up again, keeping them spread as wide as she can. She blindly feels around for his cock and finds it easily, hard and hot again, and Grim huffs when she pulls it toward her, aiming his tip at her opening. It's much too big to go inside her, but for a moment she wishes he would.He must think the same, because he moves forward, pushing his cock against her.Harry giggles. "You can't fit," she says. "Do it like this." She puts his cock between her lips, aligning it with her pussy so he can slide it through what's left of her slick and his saliva. "Like this," she says again. "It's okay, I don't mind."Grim growls as he humps her, harder than he did this morning. His growls go up in volume the closer he gets, and he doesn't last very long. Most of his semen lands high up on her pussy before it slides down over and between her lips and leaking down onto the mattress.Shame sets in again as Grim relaxes above her: she just let her dog hump her pussy. She's sick and perverted, but it was arousing and exciting and so naughty and dirty. She's so filthy, isn't she? For enjoying something like that, for being the one to suggest it in the first place, for letting a big dog use her body to get off.Through the thick shame, she wonders what it'd be like if he put it inside her. Over the next two weeks, Grim keeps getting hard and his cock is huge and he continues to hump Harry, who lets him do it in private. But while he is very intelligent, he is not smart enough to understand that while he can hump her freely in private until he comes all over her, he shouldn't do that outside of her bedroom.Especially not now that Aunt Marge is visiting and putting Harry under a magnifying glass.Harry is watering the plants today with a very small watering can, which makes it take ages. She is aware that Ripper is watching her but he's staying safely inside, away from Grim, who is lounging in the grass behind her and pretending to be asleep, but she knows very well that he isn't. Ripper already tried to come outside and Grim was up in an instant, growling in warning, looking ready to tear the much smaller dog to shreds. Ripper knew better than to approach, running back inside instead.When Harry is done watering, about an hour later, it's not even three yet. Aunt Petunia wants her busy until four, so she has some time left, which means she might as well get started on the weeding that her aunt wants her to do. It's Sunday afternoon and everyone is home, sitting together in the living room with a clear view of the garden.She spends the next hour on her knees, half afraid that Grim will take that as an invitation, and while he does get up to sit next to her with his erection sticking out, he doesn't do anything but watch her. She pretends she can't see it, but it's hard to ignore how enormous his cock is and how close he is sitting next to her. She can't help but glance at it every now and then, remembering how it feels to have it pushed up against her opening, too big to go inside but wanting it badly, letting Grim use her once every morning and twice every evening.Harry doesn't know what is normal for dogs, but she suspects that maybe Grim isn't normal. She can't tell what's wrong other than the fact that he's huge, because she doesn't know what is normal for dogs, but she's not going to ask Aunt Marge about it. "Is it normal for dogs to come three times a day? Are their knots supposed to get that big? Are they supposed to ejaculate so much and so long each time or is that not normal either?"Absolutely not.Putting away her tools, Harry goes back inside, intending to go for a shower. She's filthy and Grim is getting dirt all over the floors, which also means she will need to clean the floors afterward, but she's alright with that."Sitting there all day like a bitch in heat... your sire looks ready to breed you," Aunt Marge tells Harry casually, looking her up and down with a frown. Then she looks at the dog standing tall next to Harry and she nods. "I'll take him off your hands, Vernon, but I want to see what he's made of first.""I beg your pardon?" Aunt Petunia asks.Aunt Marge turns to her. "I thought you wanted to be rid of him.""I do, but—""I will take him, but I want to see him breed the bitch first."Aunt Petunia looks pale. "Surely you don't mean her.""Of course I do," Aunt Marge says, rolling her eyes. "Vernon, say something."Uncle Vernon sighs deeply. "Let's just give her what she wants."Harry feels faint and numb as her family discusses her being bred by a dog like it's actually an option. Her eyes well up when Aunt Petunia and Dudley leave her with Aunt Marge, Uncle Vernon and Grim. That Harry lets Grim hump her and lick her is bad enough, but even though he looks ready to do exactly what Aunt Marge wants from him, tail wagging and erect cock standing up straight, he's still just a dog, an animal."Get on your hands and knees, girl," Aunt Marge barks at her.Harry winces but finds no alternative to doing what Aunt Marge wants. She looks helplessly at Uncle Vernon, but he sits there with his arms crossed and a tight frown on his face and he's not saying anything either. What else is she supposed to do here? She doesn't have a choice, does she? "What if I won't?" she challenges, stalling more than really thinking she has a chance here.Aunt Marge laughs. "Do you want me to tie you up? I know my brother has rope, so unless you want him to go get that, you'll pull your skirt up and your knickers down."With her skirt around her waist and knickers around her ankles, Harry kneels down on the carpet, her heart pounding in her throat. Yes, she fantasised about having Grim's cock inside her, but those were fantasies and in her fantasies, it was always just her and the dog, never like this, forced on her hands and knees for a woman who isn't even related to her. To her horror, Grim doesn't need any prompting, coming over and resting his heavy paws on her back, pushing her down as he humps her from behind, his cock pushing insistently against her opening."Look, he knows exactly what to do," Aunt Marge says, sounding satisfied. "Help him inside.""It won't fit," Harry says, tears spilling down her cheeks. "Please don't make me do this."Aunt Marge gets up with a grunt and reaches between them, grabbing Grim's cock with one hand and touching Harry's pussy with the other, thick fingers searching for her opening. Harry flinches away but the woman slaps her hard on the back of her head, making her dizzy. "Don't move," Aunt Marge snaps, lining Grim's cock up correctly and pushing hard against Harry's too small opening. "Go on, boy, it's time to mount your bitch.""No, please," Harry cries, bursting into tears.But Grim is already obeying, thrusting against her opening, and Aunt Marge guides him until finally he slips inside a hole that is several sizes too small for him, Harry's pussy forced open by his enormous cock. Harry keens as Grim continues to thrust forward, pushing his dog cock deeper and deeper into her with every move.Aunt Marge steps back again, sitting back down on the sofa. "Of course the sire is as much of a freak as the bitch is," she mutters. "Look at him, breeding her like a man. That dog is not normal, Vernon, I'm telling you, but I said I'd take him and I will."Grim pushes in harder, deeper, fucking her with quick, hard thrusts that make her moan helplessly in pain and, humiliatingly enough, so much pleasure that she spreads her legs wider and pushes back against him. He's already coming and shooting her full with dog come and there is so much of it that it's already dripping out onto the carpet. His cock is too big to fit all the way inside her, which means his huge knot is pushing up against her pussy, unable to go in, and with intense shame she realises she's wishing he could breed her properly.She wants his knot so bad she's shaking with it, canting her hips to let him go deeper, and still Grim continues to fuck her, panting above her and whining every time she clenches around him when he pushes in particularly hard and deep, ramming his cockhead into her cervix and shooting waves of pleasure and pain through her."Told you, Vernon," Aunt Marge says smugly. "Your niece is a little whore."Harry is too far gone to listen to Uncle Vernon's reply, unable to hear anything over the roar in her ears as she feels herself get closer and closer to an orgasm. Dimly she is aware of them leaving, the door falling shut and then it's just her and Grim, and she can't get herself to make him stop now that they are alone, she wants to keep going until she's coming, and she's so close, so close. "Please don't stop, Grim, please," she sobs.Grim growls in reply, fucking into her so hard she has to grab the table to push back against him, her legs spread wide and her pussy already leaking, and then her walls contract around his dog cock and she comes screaming and shuddering violently. Grim fucks her for a while longer, until she sinks through her elbows, shaking badly, and then he stills behind her. He doesn't pull out even though he's no longer ejaculating, staying wedged deep inside her while she comes down from her high, her pussy leaking their combined come onto the carpet."Thank you, Grim," Harry whispers. She moans when he begins to shallowly thrust inside her again. She tries to twist away with a grunt but freezes when he growls in warning and pushes hard into her cervix. "Grim," she moans. "Again?"Grim whines in response, fucking her hard and deep for barely twenty seconds before she can feel his cock start to pulsate inside her again as he adds even more to what's already there. She wishes there was a way to trap it inside her, but even if there is, she wouldn't be able to use whatever spell it is. She isn't even thirteen yet, still has two days left before her thirteenth birthday.She is twelve and she just lost her virginity to a dog. Harry waits until Grim is finally done with her before she goes upstairs and feverishly starts packing her trunk. Yes, she loved getting fucked by Grim and she wants to do it again, wants his dog cock inside her all the time, wants to feel full again and loves the way his come is soaking her knickers and sticking to her thighs, but if she stays, Aunt Marge is going to take Grim away.She can't lose Grim.With her stuff packed, she suddenly doesn't know where to go. Anywhere but here, but she doesn't want to bother the Weasleys, and besides, there would be no privacy there to let Grim do that again, right? She wants to, desperately so, but she can't stay with the Weasleys, no way. Hermione is still on holiday, which means Harry has nowhere to go."We need to get to Diagon Alley," Harry says. "Somehow."Wand in hand, she promptly trips over Grim. The Knight Bus is mighty convenient and she lets Grim sniff her soaked underwear in the back of the bus, gasping when the frequent movements push his nose into her opening. At least nobody is able to see her do this, but suddenly she is giddy and careless. It's a good thing the person nearby is sleeping on the bed, because it'd be hard to explain why her huge dog has his nose buried between her legs.At the Leaky Cauldron, she rents a room and the first thing she does there is take a long shower while Grim watches her. She doesn't bother getting dressed afterward, drying herself off and getting on the bed on her elbows and knees, sticking her arse out. "Breed me, Grim," she says, wiggling her arse.Grim jumps on the bed and mounts her, his dog cock sliding into her gaping pussy with ease. ~fin.