Melody huffed when her mother told her that they where going to look after a friend's dog for a few days. 
Joni was having to travel unexpectedly abroad and couldn't take their pet dog with them, and at such short notice hadn't been able to arrange for a kennel to take it in. 

Melody, as a rule, and rather ironically, didn't much like dogs. 
She didn't mind the working dogs that many families had for herding sheep and livestock, or gun dogs, as generally they left you well enough alone, which was fine to her, although she still didn't like them regardless. 

It was family pets she wasn't a fan of. So often they'd practically bowl the diminutive pup over in their dreadful enthusiasm to greet a person. 
It was all well and good for an adult or her brother to have a labrador or large jack russell leap up at them, but when you're the shortest in your class and already find dogs scary, having one sniff at you and bounce up to the point it can put it's forelegs on your shoulders isn't much fun. 
Aside from their greeting many would try and lick her, "oh it's just them showing affection" the owner would say, "why is it fine for a creature which eats its own shit, and brushes it's teeth maybe once a month, and has breath to match, to lick me but if I try and kiss my mum in the morning with slightly bad breath, or my father after a cheese and garlic sandwich, is not ok?" She'd think (having been told off for saying it loud). 

Unfortunately, for all she was afraid of them, and disliked them in general, dogs seemed to like her. 
She had a sneaking suspicion it was because she always smelled faintly like a bitch in heat all the time since her first heat. One of the many joys of having a rare heat condition.

The decision was not hers to make, however, and the dog needed somewhere to be and someone to look after it for a few days, and her mother had accepted. 

So it was that Melody found she could no longer enter the conservatory as that was where the dog, when not outside, was to stay. 
Not that in the winter she much wanted to, but having the opportunity to go in, if she so desired, taken away because a large dirty animal was occupying it. 

She had voiced this complaint to her mother, who pointed out that:

A) He was just a retriever, albeit a slightly larger than average specimen, but still small compared to, say, a Bernese mountain dog, which could rest it's forepaws on her father shoulders. 

B) If she left the dog alone, it would leave her alone,

C) Sometimes one must do something one finds uncomfortable and scary because it's the right and nice thing to do for another. 

Melody, naturally, dug in on the point of being unhappy and arguing as, at this juncture, she couldn't easily back down. 
So her retort was:
A) Given it could still put its forepaws on her shoulders without effort, it was proportionally as large and any hypothetical larger dog was simply just bigger and thus irrelevant: a horse was still large even if Shire horses exist. 

B) That's not the point. Dogs are gross and scary regardless.

C) See B. 

Her abnormal intransigence and argumentiveness over all of this resulted in 

D) Go to your room then. I'll come and deal with this later. (And silently "Oh gods I hope this doesn't turn into a thing with her and she becomes a terrible teen and really argumentative during her heats. Oh gods is she in heat?")

Stomping up to her room Melody spent the rest of the day sulking alone. 
The dog hadn't even arrived yet. 

---

"Melody, come down and say hello to Joni and Fred!" Groaning the puppy slouched out of her room. She'd only met Joni once or twice in passing, and had no idea who Fred was, and wasn't much interested. 

Until she got to the bottom of the stairs when she discovered Fred was Jonis large pet dog, a retriever of some form he came easily up to his mistresses thigh. 

"Melody, you know Joni, and this is Fred, who will be staying with us remember? Just like we discussed earlier" there was a faint threat to her mother's tone, daring her to complain. Fortunately, or unfortunately, for all, Melody was rooted in place part way down the stairs as she stared at the feral dog in fear. 

The dog yawned widely, showing a mouthful of vicious filthy fangs, the stench of death on its breath. 

"Hello Mel! Long time since we last met, you were knee high to a grasshopper last I saw you. Thank you so much for looking after him, I can't believe how full the kennels are! It must be the holidays! Anyway, sorry I can't stay longer, sods law this is the only train I can get!" Joni, a sturdy springbok woman, hugged her mother before fussing the dog and departing in her battered red hatchback for the country lanes and whatever trip she was required to make.
Melodys mother waved off the antelope woman before closing the door and leading Fred to his temporary home in the conservatory. 

"See. He's not too bad is he?" The elder German shepherd cross called. "Melody, come here, maybe being around him will help your fear?" 

The puppy obediently padded over, tail curled close around her she found her mother's reassuring paw and grabbed it, almost using the taller woman as a shield she peaked in. Fred was sniffing around his new surroundings, before picking up a scent and trotting over to the two bipedal canines. 
Melody reflexively backed further behind her mother. 

"Sit Fred." The large dog immediately obeyed it's elder distant cousin, panting happily as it sniffed around, both women spotted it more or less the same time, the slight hint of red poking from the dogs sheath. 
"Well, he *is* a stud dog, and..." the canine lady sniffed, "Melody dear, have you taken your meds today?" 

"No, I'm not in heat?" Or, at least, she didn't feel like it, but the last few months she'd felt all kinds of odd things as if she was kind of in heat and not at the same time. 

"I think you may be." The older woman shooed the feral away and back to whatever he was doing before gently closing the door. 

"But I don't feel it! I can tell when...!" 

The older canine cut her off by kneeling down and resting her hands on the pups shoulders,
"Melody, honey, you've been acting all ... Not your normal self. Puberty and hormones ..." she reached for words, she'd never had to deal with this, she had normal heats and periods, she just knew what she had read in books about her daughter's condition and the additional complexities it brought to growing up. 
"Have, have you been feeling... Different?" 

The young collie cross fidgeted with her tail while looking at the floor. 
"Kinda" she said in a small voice "Sorry I was rude earlier" 

The elder woman closed the gap and hugged her daughter. 
"It's ok. You where, are, scared of Fred, and a lot is going on with your body so you're all out of sorts. I'll book an appointment with Professor Bhajan. Now, off to your room, take your meds and your measurements. Ok?" The elder canid stood and muzzed her daughter's hair. 
"If you feel "Urghy" just come and talk to me please? I don't want one of those terrible teens some people have where they're constantly at each others throats, and I don't want to be one of those mothers either." 

"Ok mum. I'll try. I just... Didn't know... it... just happened..."  With that she hurried to the safety of her room, hearing her mother opening the door and greeting Fred with a tuggy rope toy. 

Letting out a breath she didn't know she'd been holding in the small puppy immediately grabbed her medications off her desk, cracking the foil blisters to the dose she'd been prescribed and gathering the tablets into a small pile. 
Next was the part that, although necessary, she didn't like at all, taking a quick blood sample and vaginal swab. 
Taking a lancet from the pack she turned on the hand sized measuring device and opened the app on her phone, checking both where paired and working. 
Carefully slipping the test strip into place she took a few slow breaths as she held finger out and applied the self retracting lancet, with a click the hidden needle fired and she started to ooze blood. 
Dripping some into the test tray followed a routine honed over several years, since before her first heat. 
Sucking her finger her eyes watered. The pharmacy had changed what they gave her, originally it was just little needles with safety caps, then concealed ones with a click top like a pen, but these new ones she had to push down on quite hard to get them to go which only built the anticipation of the sharp stab. 
Checking it wasn't bleeding too much she moved on to the next part. Hiking up her skirt she lowered her panties just enough to expose her bald mound. With one hand she broke the seal on the first swab and eased it in to her vagina a few centimetres before rolling it around and drawing it out. She dipped the swab into a small plastic vial of liquid before withdrawing it, closing the nozzle cap and dripping the mix onto another compartment on the box. 
Putting everything into a green hazard bag for disposal, she waiting as the machine showed it processing screen. 
It took a few minutes before her phone vibrated and the devices small screen showed it's results. 
Thankfully they weren't void or really out so she didn't have to re-do the test process. 
Taking her glass of squash she swallowed her pills and looked at the results. 
Experience told her she was in heat from the values, but pretty mild, by her standards. She flicked to the historical data graphs and the big spike several month ago which she could remember well, she's been climbing the walls with sexual desire. To the point she'd lost her virginity to her brother in a rather frantic few minutes of abnormal loss of self control.

Sighing she fished her latest diary from its nook on her busy desk, undid the somewhat pointless lock and opened it. 
Carefully she copied the numbers from the machine into a big table she kept at the front before turning to the current page, where she added the numbers again below an entry she'd made about being sent to her room. 
Writing carefully she added a comment and some observations about how she felt and such, as well as noting Fred's sizable sheath and a short musing on how it'd feel. 
She'd never admit it, but despite being scared of her distant ancestor canines, she was curious about what being mounted by one would feel like. She'd grown up seeing stud dogs doing their work to keep the countryside in sheepherding dogs, and horses, sheep, goats and some birds. So she knew how fast and rough they could be. 
Quite opposite to her brother, who could be rough but never quite the same way it seemed. 
Fidgeting with her pen she couldn't think of anything more to record so closed the book, relocked it and slipped it back into place.

Everyone found it odd she kept a written diary, especially one with such a poor quality little lock which was just a toy rather than actual security, in what could only be called a "girly" diary with a set of cartoonish pink unicorns and sparkles on the cover. 
Afterall, she had a large computer with two screens and a laptop her father had brought her from work when the company had a tech renewal. She even gave tech advice to her parents and brother on occasion. 
But, apparently, "if you're reading my diary then you're betraying my trust" was sufficient justification for the somewhat unequal security stance of the medium relative to her computer.

Feeling restless but unsure what to do she booted up her computer, wiling away the time mousing around the internet and playing an RPG she'd gotten into. 
The day passed in a haze of bottled energy and strange feelings, the normal feeling of her heats soon settling on her soon after she turned in for the night, leaving her mother watching TV. 

---

She lay awake, unable to sleep, the horrible feeling of need she'd had all those weeks ago when she'd snuck into her brother's room.

She ground herself against a thick soft toy Loch Ness Monster plushes neck, humping desperately at it to try and sate her need.

But the minor orgasms did nothing to cool her. 

Getting out of bed she decided to go and see her mother, even if it was just to be told to take more meds and some sleeping pills like normal. Maybe she'd be allowed to stay up and watch TV a while to tire herself out. 

Spotting that the downstairs light was on she crept downstairs. As she reached the foot of the stairs she noticed the TV was off and door to the conservatory was ajar, strange sounds coming from the room beyond.

Curious she snuck further along, peeping around the door she saw her mother fiddling with the old camcorder and tripod. The large dog was flopped on his back, hind legs spread and cock flopped on his belly as he panted happily, tail flicking. 

His very, very, large cock.

Melody stared at it transfixed. Fred's dick seemed massive compared to her brother's, maybe as big father's (from the few peaks she'd managed to get when her parents had been fooling around. Or the times she'd seen it soft when they'd showered or dressed together). 

Her mother was nude, and whispering softly to the dog, and camera, who had started to sniff the air. 
The elder canid stepped over and started to fuss the dog before leaning down and stroking his cock and sucking it from time to time. 

Melody couldn't help but react.
It was so big.
So hot.
So very virile. 
Her traitorous body told her he'd make an excellent mate, even if the odds of fertilisation where low, the ancient parts that made her species a thing, and kept it going, flaring with desire at the sight of such a stud so close.

She stood and watched, hand slipping up under her night shirt, to slowly stroke over her desperate cunt and large clit. 
Watched as her mother gave a feral dog a blowjob.
A blowjob in front of a camera. 
As she slipped Fred's knot from his sheath and grasped it, simulating a tie and causing him to start to spray thin but bountiful cum into her waiting muzzle. 
Which after a few minutes she opened and showed to the camera as it seemed to overflow with canine cum. 

Her mind battled itself, the fear of dogs battling the deep and ancient need of a bitch in heat.

Her mother swallowed down the cum, kneeling back and showing her cunt to the camera as she spread her lips. Fred sat up and licked his softening cock clean before sniffing at the air. 
She chewed her lip trying to remain silent as she stood, hand on her desperate need, stuck for what to do. 

"Melody?" Her mother perked up, suddenly at attention, "Melody dear? Are you ok?" She scrambled as she spoke, pulling on her dressing gown she was out the door and practically falling over the pup before Melody processed what was happening and she'd accidentally let out a moan.

"Melody! What. What're you doing up?! Why..." Her eyes went wide as she realised what her daughter was doing, "Did. Did you see..." Melody nodded. 
"I can...it..." the older canine failed for words for an explanation. 

"Mummy... I'm so needy, and, that was... Please can... Can I play with him?" Melody begged, the desperation clear in her voice, the smell of her heat clear and potent.

The soft click of claws on tile, followed by his muzzle appearing at the bipeds knee announced Freds presence and that he could smell a bitch in heat. 

"Are... Are you sure dear?" 
Melody nodded hard, eyes wide and desperate. 

"Okay..." she rested a hand on the ferals collar and tugged him back as she lead her daughter on a path neither quite knew where it lead, but both wanted to find out.

Melody hesitated, her fear rising, as she followed her mother into the conservatory. 

"Honey, you don't have to" she was cut off as the pup pulled her nightdress up and off, the action suddenly releasing much of the scent of her heat which had been trapped under the soft pink fabric. 

"I want to. I need to." There was a set and determination suddenly about the pup.

"That's one way to deal with one's fear I suppose" elder shepherd dog thought as she mentally shrugged in confusion. 

She watched as Melody carefully reached a paw out to the feral, which dutifully sniffed and briefly licked at it, slowly the puppy started to reached forward and pat Fred softly between the ears, her tail still curled defensively. 

Lowering his head Fred caught her scent properly, and with a firm shove knocked her off her feet. 
Melody landed on her ass with a yelp as the large dog went to sniff her cunt. 
Her primal urges fought with her fear, the former telling her to turn over and present herself to the feral male as the latter screamed for her to run. 

It was unclear which truly won out as she moved to be on all fours and started to crawl for the the door. 
She froze as the large dogs weight landed on her back, forepaws hooking over her hips.

As soon as he landed his hips started to rapidly thrust as he sought to get purchase on the smaller pup. 

Her mother watched in horny fascination, noticing the camera still on and recording she unclipped it from the tripod mount

It took only a brief couple of minutes for the horny stud dog to find his target, the tip of his cock spearing into Melodys tight puppy pussy. 
He started to hump in ernist, forcing more and more of his large cock deeper into the heated bitch below him. 

"Ahh! Muuummmy!" Melody wailed, part in desperate lust, part in fear and pain as seven inches or so of thick raw doggy dick was unceremoniously forced into her young sex. 

"Ohh, good girl! Good girl! Take him! Take the doggies cock for mummy!" She cooed, scooting forward and down to get a close up of her puppys stretch need, how her bald mound with is smattering of freckles stretched and bulged as the thick red/white dick of the heavy dog rammed into her, how his sizable ball sack swung with his rapid thrusts into her.

Melody let out more whimpers and moans, the initial pain of his entry still present but getting overwhelmed by the pleasure of being stretched so deliciously and painfully, of the friction his dry entry and wide shaft where causing within her, the simulation her clit internally. 
Fear and joy, pain and  pleasure mixed in a hedonistic mélange in the puppy's heat addled mind. 
She was so desperately close to orgasm. The weight of the large dog pinning her in place, his claws scraping her flesh and fur, his hot breath down on her scruff as he panted over her. The desperate fast strokes as he pistoned his cock in and out of her batter needy pussy. 
It seemed to last forever, but the timer on the camera said only a couple of minutes had elapsed. 

"Oh good girl, are you going to take the doggys knot? Are you going to be a brood bitch for mummy? Filled doggys cum?" She moved round to focus on the pups snort, drool and tear streaked face. Melodys eyes where unfocused and half open, jaw slack as her tongue hung out, panting desperately like the bitch in heat she was. 

"Wanna, wanna take doggys knot, be... Be his bitch. So close, mummy I'm so close... Please, I wanna cum... Cum for doggy, cum for mummy..." Melody panted, pleading with her mother for the orgasm which had been eluding her. 

The camera moved, a wide shot of the feral dog hunched over the smaller pup, his hips working as he did what nature told him: breed. 
It moved to show his balls and the view up and under from the back, his fuzzy ass and big swinging balls. 
Then round again, up and under to show him, with a final few bucks his knot slipped from his sheath and into the pup, inflating immediately. 

"Muuuummmmmyyy!" Melody howled, echoing off the glass walls of the room, as the already large cock grew and sunk deeper, a fist sized ball of hot dog cock forming and tugging at her cunt. Fred kept humping a few seconds more, violently jerking the small puppy girl around below him before he slowed, content and spraying his hot watery cum into her, the knot locking the pair together for as long as it took to deflate enough to pull from her cunt. 
Her mother withdrew the camera quickly wiping the lense free from her daughter's cum, getting a wide shot of the smaller shepherd dog shuddering and jerking as she came hard, still coming after that great initial howl. 

Awkwardly Fred turned, lifting his legs up and over the the overwhelmed girl attached to him by the sex organs. Melody sagged forward, as she did so her mother pushed a low step stool under her shoulders, letting the pup slump on it rather than down onto the floor. 
The mind blowing orgasm had left the pup tired and incoherent. 

"Ohh, well done. Good girl! Gooood giiiirrrl! You took the doggys knot, I'm so proud of you. Is he filling you with doggy cum? Did you have fun?" Melody nodded, a wide stupid grin spreading over her muzzle, tail flicking slightly. 

"So warm, so big" she slurred.

The older woman moved around, gently holding her daughter's and Fred's tails asside to get a close up from above of the tie, but it was hidden by their asses. Shifting she got a glorious shot of her puppys young mound straining against an unseen force, only the root of Fred's sizable cock giving any hint at what lay within.

The pair where stuck for several minutes, which Melodys mother spent praising and reassuring the spaced out pup, before she started to whimper and whine. Fred was starting to shift, and pull, fetching the camera she managed to get it up and under Melody before he started to get free properly.

His knot bulged within her abused pussy, straining against her inner muscles, the red lobes peaking from between the pups lips. 

"Deep breath dear and relax. It's ok, he's just trying to untie. You're clenching and making it harder for both of you. Deep breaths, good girl."

Melody whimpered as she took long slow breaths, finally the dog pulled out, his cock popping free, and dragging out quickly, leaving the pups cunt gaping slightly, a trickle of his cum mixed with her juices rolled out, forming a drop which dangled from the large nub of jer clitoris. 

Fred walked a few steps away before flopping down, softening cock retreating into his sheath. After a couple of moments he started to snore.

Melody whimpered and sagged further against the stool. 

"Such a brave girl. I'm so proud of poppet. Let's go and wind down." She scooped the pup up, surprised she still could. Melody wrapped her arms around her mother's neck as her mother hiked her knees up over her waist. 
"I'm so proud of you." She nuzzled the tired pups cheek as they climbed the stairs.

Carefully depositing the nude pup on the large bed in her parents bedroom, the elder canine quickly nipped over to her daughter's room, grabbing a book at random off the shelf and a fresh pyjama set, and most importantly the noodley stuffed toy of a stop motion sheep character she liked. 

Scooting into bed with the pup, they cuddled up as she started to gently read to the pup. 

After a few pages Melody was out. Smiling lovingly down she brushed a few strands of fur to behind the pups ear. 
She didn't know where this would lead, but she had suspicions, and she looked forward to introducing her daughter to whatever carnal acts the pup wanted.

Climbing out of bed to turn the lights off she picked up the camcorder and stopped it filming. 
Not matter what, her and her husband would definitely enjoy watching the footage from it together, hopefully with their daughter...