A Familiar Temptation

Lisa stepped outside, the fresh spring air making the young wolf's long hair blow back as she closed her eyes and breathed deep, taking a moment to shut off all thoughts and distractions of the outside world, focusing solely on the nature around her: the slight winter chill still in the wind, the fresh smell of the grass all around her, the chatter and singing of what felt like hundreds of different birds in the trees and in the skies above. She liked to have a minute or two to steady her mind at the end of her school week, to wash away any thoughts of her work and studies and to just relax with the nature surrounding her. She hadn't noticed any of her classmates doing anything similar, the girl speculating that her odd ritual might have something to do with her slightly special family situation, her heritage leaning a fair bit more towards the wild side than most others'. Lisa opened her eyes and sat down on a bench next to the road in front of her school, setting her backpack neatly between her legs as she waved at a few of her friends she spotted walking off, smiling and quietly humming to herself, trying not to fidget. She had just turned 18 years old on that day, a few of her very close friends coming over to her house later on to celebrate, something she was slightly worried about even though everyone she had invited already knew the secret she wanted to keep as buried as she could. Only a few minutes had gone by before she noticed her dad's car coming around the corner, her tail wagging slightly as she stood up, the car coming to a stop right in front of her. She opened the backdoor, about to say hello to his dad when she froze from surprise, a large feral wolf laying across the back seat staring her in the face, grinning, 
"Surprise~!" 
"Wolfy!? What the hell are you doing here?" 
Wolfy was Lisa's brother, her big brother, both in terms of size as well as age, being almost ten years older and nearly twice her size. Both of the wolves had navy blue fur, becoming more pale towards their bellies before turning into pure white, the largest difference in their looks being her green eyes versus his blue eyes. Of course, the biggest difference overall was that he was feral, semi-feral to be more precise, while she was anthro, a fact that made her nervously glance around to make sure no one had spotted him before she quickly clambered inside, closing the door as Wolfy nuzzled her hand, his fluffy tail whacking the backrest, 
"I had some free time, so I thought I'd pop down here for the weekend, stuff my belly with dad's cooking. Oh yeah, and your birthday of course, but that's more of an afterthought, dad's cooking is definitely the main reason."
The two laughed as she gently pet his head, the car driving off. 

As the two siblings chatted in the backseat, the dad turned the car into a parking lot of a supermarket, 
"I still need to grab a few things for your party tonight, then we can get back home."
Lisa's face dropped, a slight dread creeping up her spine as both of the males hopped out from the car, sighing as she joined the two, trying to stay at least a few steps behind while the trio was walking into the store. She really didn't want to be seen with her brother, their very obvious similarity instantly telling all the other shoppers that the pair were siblings, a taboo that she didn't want connected to herself. An anthro and a semi-feral being siblings could only mean one thing: that their parents were similarly an anthro and a semi-feral. A pairing between the two groups wasn't illegal, as semi-ferals did of course have consciousness, but it was generally held in some disapproval by most people, the taint of bestiality still hanging above it. Her father and mother did obviously love each other very much, and neither of the two were ashamed of the other, but Lisa was still slightly embarrassed at the looks her dad would get when he and her mother would walk around town. She subtly tried to distance herself from the two males walking in front of her, slipping between different shelves as her dad and brother browsed another, her face blushing every time she felt a stranger's gaze scanning the group. She tried to not focus on everyone else, sighing and glancing at Wolfy, the feral canine standing at his father's height even when on all fours. His tail flopped up slightly, Lisa's eyes immensely drawn to the immense set of balls hanging between his back legs, his sheath nestled between the furry orbs, her cheeks glowing even more red. Even after living 18 full years with semi-ferals around her house, she still hadn't entirely gotten used to them not wearing a shred of clothing, though she found the male form of her brother even more distracting than her mom's nethers. She noticed Wolfy staring at her through a reflection of a glass door, the girl immediately averting her eyes away from his family jewels, trying to act casual and hold a straight face as if she hadn't just been busted of ogling at her sibling's balls. She thought she might've seen a slight smirk on his muzzle, shaking her head at his immaturity, the annoying mutt probably lifting his tail up just to make her stare at his undercarriage as a joke at her expense. 

After a grueling and awkward shopping spree at the local supermarket, the trio emerged from the store with a shopping cart full of grocery bags, Lisa helping her dad load them into the car before everyone piled back inside, taking the short trip back home. She didn't say a word to her brother on the way to the house, feeling an odd tension between herself and him, choosing instead to stare out the window, trying to keep the image of his goods out of her head. The car pulled into the family's garage, the large shutter door rolling down as the dad hopped out, opening the back door to let Wolfy out, going around to the trunk to start on unpacking the groceries, 
"You two can go on ahead, say hello to your momma, I can get the stuff out and sorted by myself."
Lisa nodded as she opened the door separating the garage from the rest of the house, her brother stepping through and eagerly trotting along as their mother appeared from behind the corner, both of the ferals happily wagging their tails and running up to each other as she nuzzled him, 
"Oh, there you are, you gotta get back home more often than this! It's been nearly half a year since you've last been back!" 
She touched noses with Wolfy before walking up to her daughter, circling and wrapping herself around the girl in a sort of hug as she rubbed her head against Lisa's chest, 
"And you, happy birthday, princess~! Sorry I couldn't see you off this morning, I had an appointment on the other side of the city before daybreak and I didn't wanna wake you up just to make you sit through my babbling~" 
Lisa giggled and patted her mom on the side, 
"It's alright, and thanks."
"So, what's my sweetie gonna do now that she's all grown up and adult? If you're thinking what I'm thinking, use a rubber, I'm not old enough to be a grandmommy quite yet~" 
"Ew, mom, stop~!" 
The two laughed as they moved into the living room, the girl smiling as she watched her mom and brother hopping up onto the sofa, casually chatting with one another, the two ferals almost completely filling up the sofa just by themselves. She couldn't help but to crack a slight grin as she suddenly imagined the first time between her dad and mother, the differences in size and anatomy making for what must have been a quite interesting experience. 

Lisa heard her dad setting up in the kitchen, slipping into the room to watch as he gathered a few pots and frying pans on the stove, beginning his preparations for the upcoming meal. Since her mom would have had a bit of a difficult time trying to cook up dinners with no opposable thumbs, her father had taken up the position of cooking in the family, becoming quite the masterful chef during the years. She watched as he simultaneously started on a handful of different dishes, juggling almost a dozen different tasks at the same time, quickly glancing at her as he shoved began dicing up vegetables, 
"C'mon, go get dolled up or something, I don't need an audience here. I don't work well under pressure, and I don't trust you not to eat up all my creations before the guests even arrive."
She chuckled and turned around, yelling from behind the corner as she headed upstairs, 
"Alright, but don't come crawling back to me when you need someone to do all the grunt work for your cookery."
Lisa stepped into her room, closing the door before stripping down to her underwear, giving her mostly nude fur a few quick sprays of a fancy perfume that she had borrowed from a friend, opening up the closet to pull out the outfit she had prepared earlier on during the morning. She carefully pulled on the clothes, twirling around in front of the mirror to admire her look, a white tube top and short skirt. To finish her outfit, she slipped on a pink collar around her neck, smiling at herself as she pulled out her makeup bag, settling in to make a few finishing touches. About an hour later, the first of the guests arrived and the celebrations began, Lisa's family and a handful of her closest friends getting together for a meal before moving into the living room to watch her open her gifts, the group spending the evening laughing and chatting. Even though the friends attending her party already knew about her mom being feral beforehand, she still found herself slightly anxious at times during the party, her worries alleviated somewhat as the hours went on. 

The last of Lisa's friends departed just as the final few rays of sunlight disappeared from the evening sky, the street lamps blinking on as she helped her dad clear out the table and stuff all of the leftovers into the fridge. Both of her parents bid her goodnight, her mom giving her a kiss on the cheek before the pair slipped upstairs and into their bedroom, leaving Lisa alone downstairs. She glanced around, finding no hint of her brother, assuming that he had already disappeared upstairs into the guest bedroom to get some shut-eye when she wasn't looking, sighing and stretching her arms as she slowly walked to the backdoor, stepping out onto the deck. The frigid night breeze blew right through her thin clothes and fur, making her shiver slightly as she huffed with delight, having always been a fan of cooler temperatures while her dad always liked to keep the inside of the house at just a hair above comfortable levels of heat. She had found the warmth indoors especially suffocating that night for some odd reason, the fresh wind helping calm her down as she closed her eyes and leaned up against the railing of the deck. A few seconds went by before she suddenly heard some rustling coming from a bush right next to her, the noise startling her, making her jump back with a yelp, almost stumbling down onto her flank. Wolfy appeared from the bush, grinning at her, 
"Sorry, didn't mean to scare you like that."
"Wolfy! What the hell are you doing out here? I thought you were already upstairs." 
"Well I drank a fair bit during the party, and toilets don't exactly work all that great when you're on all fours."
Lisa laughed and leaned back up against the railing, looking at the night sky as her brother sat down next to her, 
"So, what'd you think of your party? Had fun?" 
"Yeah, definitely. I can never say no to dad's cooking."
"Very true. Your friends are nice, I think I might've met that bird before, was she the one you were friends with all the way back in kindergarten?" 
"Yeah, Alice."
The two talked about their past as they watched the city all around them slowly going to sleep, lights disappearing from windows one by one. 

Gradually, as the siblings' conversation progressed, Wolfy inched closer and closer to Lisa, soon pressed against her side as his tail sweeped the deck behind him, 
"So, how about your boyfriend situation? Have anyone lined up yet~?" 
She giggled and playfully shoved him
"Ugh, don't you start with me as well. Mom constantly pokes her head over my shoulder when I'm on my phone, trying to see if I'm talking to any boys. She even gave me a box of condoms a few days ago!" 
The duo laughed, the feral's chuckling slowly trailing off, 
"I mean, maybe it might be a good time to find someone, because… you know…" 
She looked at him, dumbfounded, 
"What? What do you mean?" 
"Well it's just that… heats are easier when you've… got someone…" 
"Heats? What?! I'm not… I'm not in a heat."
"Well not yet, but I'd say that probably in a day or a few."
Lisa stared at him for a few seconds before he tapped his nose with one of his front paws, the girl instantly blushing and looking away. Of course, ferals and their sensitive noses, knowing her body better than even she does apparently. Did all of the ferals she hung around know about her situation, or just the canines? And for how long had it been so obvious? She groaned and buried her head in her hands, thinking about all of the semi-ferals that she had in her classes, her tail going limp. Wolfy laid down on the ground next to her, relaxing before opening his maw again, 
"So? Have anyone who could help you out?" 
"No! No I don't. I'm just… gonna have to stick it out I guess."
She sighed and watched the birds flying above her, 
"I don't know how the hell mom keeps her calm whenever she goes into heat, I hate it."
Her brother stifled a laugh, smirking, 
"Well, I'm pretty sure dad has something to do with that…" 
The two giggled, Lisa turning to him to say something when she noticed him slyly staring up her skirt, her maw hanging open as she stuttered,
"I… I'm… gonna go…" 
She quickly walked away, disappearing back inside and almost sprinting upstairs to her room, her mind blurry from a mixture of shock, rapidly approaching heat, and the few drinks she had enjoyed during her party. 

Lisa undressed herself and dove under her blanket, planting her head on her pillow with a sigh as she closed her eyes, intent on cleansing her mind and getting some rest to help organise her thoughts. She fell asleep after only a minute or two, anxiously tossing and turning until the sun appeared back up in the sky, a stray ray of light beaming right into her eyes and stirring her awake. She groaned sleepily, pulling her pillow over her head and moaning into it, her few hours of sleep rewarding her with a headache and a brain that was only barely conscious. Though she could have easily slept for at least a couple more hours, the loud chirping of the birds right outside of her window and the roaring of lawnmowers all around the neighbourhood made that prospect just about impossible. Sighing, she flipped the pillow back under her head and carefully cracked her eyes open, blinking and squinting at the bright light filling her room as she tried to adjust. Lisa's brain drifted back to the hurried end of the conversation between her and her brother last night, her mind still split in two about the whole thing. Wolfy was almost definitely trying to intentionally peek under her skirt, which went far beyond the usual pranks and jokes that the pair liked to pull on each other. Any ordinary guy trying to pull something like that would have been bad enough, but he was her older brother, they were family! On the other hand, he was also a semi-feral, one with a very sensitive nose, and she was right on the cusp of her heat. Even though she hadn't really realised it creeping up on her, the cloud of pheromones and subtle scents she was sending out were probably still having an effect on the males around her, especially when it came to ones particularly sensitive to them, such as Wolfy. So how much of his act had actually been his conscious decision, and how much of it was his brain drunk on her pheromones? She thought back to the shopping trip that she had taken with her brother, and how she had caught herself staring at his junk, were their acts all that different? The girl shook her head and threw her blanket aside, stretching as she stepped out of bed. She'd just put all of it aside, deciding to not bring it up in any way to anyone, last night did not happen. She peeled the clothes she had thrown all around her room off of the floor and put them on, too dazed to go digging in her wardrobe for a fresh set of clothing. 

Lisa stumbled downstairs, rubbing her eyes and yawning as her nose twitched, following the delicious scent of bacon and eggs into the kitchen. The rest of her family were already up, her dad finishing up the last few items of breakfast on the stove as he turned towards her, smiling, 
"Morning princess, rough night?" 
She smiled and picked up a plate, nodding before sitting down on the table, opposite from her brother. She glanced up at Wolfy, accidentally making eye contact with him for just a split second before quickly looking back down at her breakfast, his eyes still lingering on her gently blushed face, an almost undetectable grin on his muzzle. Lisa's family all merrily chatted amongst themselves as she mainly paid attention to her chow, her mom giving a chipper suggestion towards the end of the meal, 
"How about we all go out on a walk, just like we used to back in the day? It's real sunny and nice outside, might help wake us all up after the night."
The males both mumbled in agreement, the trio's eyes all landing on Lisa to see what her opinion was, the girl giving a nod after a few moments of deliberation, still hesitant about being out and about with her semi-feral family. After cleaning their plates and clearing the table, the group all stepped outside, starting the hike towards the nearby park. Lisa once again tried to lag behind the rest of her family, staying a few steps behind in order to not at least quite so obviously be tied together with them, every glance from an onlooker making her more and more nervous. Wolfy however didn't give her the opportunity to stay separated, the wolf slowing his trot to slip right next to her, not saying a word but sticking to her side like superglue. She felt the spring temperature starting to eat away at her, pulling her pink collar and panting as she tried to stay calm and collected, her whole body itching, the young canine more fidgety than normal. She knew that her heat was starting to kick in properly, the first few whispers of her needy spade starting to claw at her mind. She jogged up to her parents, clearing her throat as she tapped her dad on the shoulder, 
"Sorry, I gotta run off to the little girl's room for a sec."
"Sure, no problem, we'll take a break here."
As she walked off towards a small building off to the side of the footpath, Wolfy watched her with narrowed eyes, suddenly sprinting off to catch up with her, shouting over his shoulder, 
"Actually, I need to take a leak as well, be right back."

Lisa heard the grass rustling alongside her as her brother trotted up to her, sighing as she stared ahead, not looking towards him as she whispered, 
"What are you doing?" 
"Going to the toilet, same as you." 
"Oh yeah? I thought that toilets didn't work when you've got four legs, at least that's what you said last night."
"No, I said that they don't work all that great. But there aren't really a lot of nice bushes completely out of sight here, so I can make do with a toilet."
She huffed and walked up to the small bathroom, noticing that it was completely unisex, the city not wanting to bother setting up two completely seperate bathrooms for an area where the toilets would get low amounts of use. She shook her head and walked inside, Wolfy slipping in right behind her, his tail hovering a hair above the floor, his ears on alert. Lisa quickly disappeared into a stall, locking the door and planting her back against it, taking a deep breath as she fanned her shirt. She didn't understand what her sibling was up to, his actions were starting to firmly cross the line to something more than just some innocent fun and horseplay. She looked down and pulled up the front of her skirt, seeing the outline of her plump spade through the white fabric, a large glistening spot of her juices already soaked through it. She gently brushed her thumb across her pussy lips, the slight touch enough to make her legs turn into jelly, the wolf stumbling forwards and grabbing onto the toilet paper dispenser for balance, accidentally blurting out a tiny yip as she grimaced. Panting as she got back up onto her feet, she knew she couldn't keep her composure up for long, her mind already starting to stray into lewd territories whenever she didn't consciously focus her thoughts. She hissed and cursed her nethers for getting her into the situation, sitting down on the toilet lid to let her wobbly knees relax, 
"Damnit, why couldn't you have waited until after my birthday and after Wolfy's visit!?" 
She leaned forwards, resting her elbows on her legs, the cool surface of the toilet lid pressing against her cookie, making her close her eyes and moan softly under her breath, the canine soon rocking her hips back and forth to grind her lips on the toilet. She was snapped from her trance-like state as the toilet in the stall next to hers was flushed, huffing as she quickly stood up, looking down to see a large stain of her pussy juices smeared across the lid. She grabbed a handful of toilet paper to wipe up the mess she had made, tossing the paper into the toilet and flushing it, trying to put on a poker face and to steady her breath as she unlocked the door. 

Lisa stepped out from her stall, her brother already standing outside in front of the sinks, the two wordlessly locking eyes. She saw his nose twitching as he sniffed the air, a flash of red appearing between his back legs as he shifted his stance, a near constant stream of clear liquid dripping down and pooling up on the tile floor under his belly. He sat down, showing off his sheath to the girl, nearly half of his shaft poking out already, precum spurting from the tip with every heartbeat, the effects of the scent of his sister's heat on him very obvious. She stared in awe at his erection, more and more of his girth sliding out from his sheath as she gulped, her panties clinging to her slit. She knew in the back of her mind that she absolutely shouldn't be thinking or looking at her own family member in that way, but every fibre in her body at that moment wanted to make that male hers, to have him fuck and breed her, no matter their relation. Wolfy could sense her need, the large feral standing up and slowly walking up to her, the girl's emerald green eyes looking down at him as he slipped his muzzle under her short skirt, his nose pressed right against her underwear, prodding and poking at her spade as he sniffed deep, his huffs and snorts of hot breath making her whimper and shiver. Just moments before Lisa got too absorbed and lost in the moment, she shook off the cloud of desperation and pushed her brother's head out from between her legs, panting as she stepped back, looking towards the door to the bathroom, knowing it could open at any time, 
"No! Not… not here… if we're gonna do this… we need to do it somewhere more private."
Wolfy licked his lips, savouring the tiny taste of his sister he was able to steal before nodding, 
"Alright, I know a place."
A few minutes later, Lisa peeked out from the bathroom, glancing around to make sure no one was looking in her direction before fully opening the door and stepping out. Her brother slinked through and quickly disappeared behind the building, making his own way towards the place the pair had agreed on, not wanting to be seen by anyone else with his red rocket swinging around between his back legs. Lisa walked back to her parents, smiling as nonchalantly as she could, his dad standing up from the bench that he and her mom were sitting on, 
"There you are, thought that you and your brother had fallen into the toilets. He still in the bathroom?" 
"He… actually said that there was a pretty nice path that cut through the middle of the park, I thought that me and him would take it, meet you two on the other side."
He raised an eyebrow at her, not entirely buying her story but also not sure of what she was hiding, finally shrugging, 
"Alright, me and your mom are gonna be waiting near the ice cream stand at the northern end, we'll meet you there."
The girl turned around, walking away with a relaxed pace but speeding up to a hurried jog as soon as she was out of eyesight of her parents. 

Lisa made her way towards the edge of the park, spotting a small building near a playground, making sure no one was watching her before walking towards it. She looked around for her brother, startled as he suddenly jumped out from a nearby bush, 
"Jesus, can you give me some warning when you're doing that next time around!" 
"Sorry, didn't want the cubs on the swings staring at my junk. Now c'mon, open the door!" 
She grabbed onto the handle, opening the door and peeking through, a desk with a chair and a few shelves inside. Wolfy nudged her out of the way and stepped inside, beckoning for her to come in as well, the girl closing the door and locking it, 
"What is this place?" 
"It's the ground keeper's office."
"And how did you know that it would be open? Or that he's not gonna come in here?" 
"I've… brought a few girls in here before. Just trust me, we're nice and safe here~"
Lisa looked out of the small window, watching a couple walking along the pathway only a few feet away from the building, still slightly unsure about exactly how risky the whole situation was. Her pussy didn't particularly care about how likely she was to be caught however, a jolt of heat rolling through her body, her attention shifting back to her brother. He was sitting in front of her, his tip glistening with precum as he panted, waiting for her to make the first move. She reached under her skirt with shaky hands, her panties dropping down to her ankles a few seconds later, the young wolf spreading her legs and kicking her underwear away to invite Wolfy to work his magic. Finally allowed to do what he had been dreaming of for the last day or so, the feral jumped forwards and stuffed his head under her skirt, sticking his muzzle into her puffy and leaking wet spade, ramming his tongue inside as she moaned and whined, falling forwards to lean on his back for support. His huge tongue reached deep inside of her, hitting all of the spots that her fingers or toys could never hit, her eyes rolling back as she thrust her hips forwards, grinding her pussy lips on her brother's face. 

Gritting her way through the constant barrage of sloppy licks and kisses, Lisa reached down underneath Wolfy's undercarriage, fumbling around in his belly fluff until her fingers wrapped around the thick and rock solid shaft, slick with precum. She gave the girthy rod a few pumps with her hand, needing to shift her other hand down there to grip it with both, his back legs spreading wider apart and his tail rising up as he huffed against her crotch. His tongue suddenly glanced against just the perfect spot, the bullseye causing Lisa's knees to slam together and lock her brother under her skirt as she trembled and shrieked uncontrollably, her juices running down his chin like a waterfall as he continued lapping at her spade, drinking down her delicious nectar. Overwhelmed by her orgasm, she stumbled forwards, falling down off of the feral's back and onto all fours, rolling onto her back on the floor, gasping for air and mumbling incoherently. Still needy for his fair share of the fun, Wolfy prodded his sister on her side a few times with his nose, a grin on his face as he suddenly trotted towards her back end, tugging off her shoes and her socks with his mouth. Having at least somewhat recovered from her ecstatic episode, Lisa pried her head off of the floor to look down at what was happening, seeing his brother stepping over her legs so that his cock was hanging down directly over her bare feet, a stream of warm precum already slathering them up, an expectant look on his face. Understanding the hint, she reached one feet up to rub against his length, running it up and down, sliding the tip between her toes. The fur on her feet completely soaked in precum and a large puddle already on the floor, she lifted her other foot up to sandwich the shaft between her soft soles, jerking him off with the pair, using her toes to massage his knot as she rolled the rest of the dick back and forth in the middle of her silky feet. 

Lisa kept a watchful eye on her brother's face, trying to read how close he was to climax as she continued milking and squeezing his canine cock with her feet, reaching down between her legs to simultaneously finger herself as well. Every time he seemed to be on the edge of release, she'd pull back and ease up her working, only slowly teasing his tip by stroking it between her toes as he panted and whined, drooling all over the floor from both ends. Finally, she pulled her feet off of his crotch completely, the feral whipping his head towards her in a combination of absolute betrayal and desperate fury, the girl sinking her soaked fingers into her maw before giving him a sly smirk, 
"That's for peeking under my dress, you're gonna have to wait for a little while longer before you can cum~"
She slowly rose up onto her knees off of the floor, Wolfy sitting down right in front of her, Lisa opening up her mouth and pressing her lips up against his muzzle to kiss him as best as she could, moaning as he licked the inside of her maw, reaching under his belly to fondle his heavy balls. Little by little, she leaned further forwards, soon finding herself on all fours in front of her brother, the hungry wolf throwing his front legs on top of her back and pulling her into his crotch. She let the throbbing dick rest on top of her head, a cascade of precum showering her, dripping down her fur and eventually soaking into her shirt as she moaned, finally opening up her mouth to take the tip inside. As soon as Wolfy felt her heated maw starting to swallow him up, he pressed his hips forwards, sending most of his shaft right down her throat, the girl handing his girth and length with admirable comfort, still flinching and groaning slightly at the sudden intrusion as her throat bulged out. After letting her adjust for a few moments, only barely restraining himself, the male let go of all self control, letting his feral desires burn bright as he fucked her face, plunging her throat with every thrust. She was able to do little more except to stay still and keep her jaw open as pre and spit ran down the sides of her mouth, her eyes closed. 

Lisa endured his brother panting and heaving on top of her as she swallowed down his pre, her lips caressing his knot and sending jolts of pleasure down his spine every time he rammed his rod down her maw. Being facefucked only increased her hunger for a male, her pussy begging for attention as her muffled cries of pleasure filled the small office, her eyes suddenly snapping open as she grabbed onto Wolfy's back legs to stop him from humping her muzzle, pulling his cock out from her mouth. She needed him inside of her, and she didn't want a drop of his seed wasted on a blowjob. She lurched off to the side, laying down on her back with her legs spread far apart, a finger splaying her puffy lips open as an invitation to her sibling. He nodded towards the desk on the other side of the room, whispering with a breathy tone, 
"There should be some condoms somewhere in the lower drawer, you can g-" 
Lisa grabbed onto the scruff of his neck to gently pull him forwards on top of her, the girl's other hand wrapping behind his knot and guiding his dick towards her waiting entrance, 
"I don't want any condoms, I want you~!" 
Despite a small portion of his brain still yelling at him about what a bad idea it was, Wolfy could never say no to a female in the midst of a bad heat ordering him to fuck her raw, the feral wolf hunching down on top of his sister, putting his front paws on her shoulders for some leverage as she pressed his tip against her spade. With a quick thrust, he was inside of her, the girl's scent, her tender whines, and her incredible tightness immediately enthralling him. Losing control of himself, he ploughed her on the floor of the office, neither of the two caring about any of the other people going about their day just outside. 

Melding together into one big pile of fur and lewd moans, the two canines kissed and fucked in a passionate frenzy, Wolfy hammering his sister as fast as he could. After an extended session of teasing and edging, having sniffed Lisa's heat for the last 24 hours, it was only a matter of time until his dam would burst, his feral grunts and growls growing in intensity as she held onto him, burying her face in his chest and moaning. She felt her pussy lips being gaped apart as his knot pressed against her cunt, her legs shaking as he suddenly sunk balls deep in her, tying her spade. Both wolves held their breaths, listening to each other's rapid heartbeats as his first shot of cum flooded her depths, the warm rush of liquid filling her up, a mixture of her juices and his sperm staining her ass cheeks. Finally taking a breath and letting go of her brother, Lisa collapsed on the ground, gasping and shaking still as she was being pumped full of semi-feral seed, the feeling of being bred and creampied enough to make her almost pass out from ecstasy. Wolfy laid down on top of her, gently nuzzling her cheek as she chuckled weakly, the whole situation finally starting to sink into her head, 
"What the hell are we gonna tell mom and dad?!" 
"I definitely vote that we don't tell them anything, I'm pretty sure mom would have my head if she knew I knotted you."
"I don't think they're gonna buy that absolutely nothing happened here, at least not when I'm in this state~"
She looked down at her nethers, her skirt splattered and painted with bodily fluids of all types, her fur dishevelled. She continued, still smiling, 
"And what if you end up actually knocking me up?" 
"Well for the first point, there's a bathroom right through that door, you can wash up in the sink. And as for the second, just tell 'em that some particularly handsome classmate helped you a little during your heat. Dad would probably be sympathetic, at least with him knowing what it's like to be into semi-ferals enough to make some stupid decisions."
Lisa giggled and playfully punched her brother on the ribs, pushing him over onto his back and rolling on top of him, getting up on her knees to pull the plug from her spade. Both canines groaned as she tugged at the knot, a huge splatter of cum spilling out onto his belly fur as soon as she managed to pull herself away, sighing and grinning as she stumbled into the bathroom with unsteady legs, leaving Wolfy to pant on the floor.