There's nothing quite as pleasant as being inside a warm house during a snow day, watching tiny flakes flitter about the icy wind on an empty street. It certainly beat being outside in that cold, trying to find shelter in a dumpster or cardboard box, having to fight off other Pokemon for scraps, hoping you wouldn't freeze to death by morning and become a Ghost-type while you slept.

Umbreon was thankful he and his siblings didn't have to go through that anymore.

When they were all Eevees, they grew up on the streets, living day-to-day off of trash, living in the shadow of humanity. Odds were that despite his best attempts, they would all eventually die of starvation or get eaten by other, carnivorous Pokemon, had they not been rescued by their Master, Jimmy. Jimmy had found them living out of a cardboard box, hungry and fearful and desperate. The human caught them and took them all home, feeding and cleaning them, giving them toys and beds and free roam of his luxurious home. He even helped his siblings evolve, handing out evolving stones to turn them into Flareon, Vaporeon, Jolteon, Leafeon and Glaceon. Despite their initial reluctance, he earned all of their trust, to the point that he and his sisters evolved into Umbreon, Espeon and Sylveon. He didn't force them to battle (though his younger brothers wanted to), didn't force them to go to pageants (though his youngest sisters wanted to), and seemed content to just let them lounge around his house all day and night. For that, Umbreon was grateful.

That being said, all this free-time gave Umbreon time to think about... other problems. Namely, that he was stuck all day with a bunch of female Eeveelutions entering heat... And he might have a sister fetish.

It was his fault for going onto Jimmy's computer. He left the thing on one night, and out of curiosity Umbreon started looking at what he was looking at - which was Pokephilia, or Poke-Porn. Jimmy's interest was more on the Anthro-side of things (Gardevoirs, Blazikens, Gothitelles, etc.), but the sites he frequented had lots of stuff on other Pokemon as well, especially Eeveelutions. Granted, he hadn't spent any time with any of his kind outside of his brothers and sisters, and he did think their evolved forms were beautiful. But looking at these pictures and videos of Umbreons mating with Espeons, Vaporeons, Sylveons, it started making things click in his mind. He'd never felt as dirty or aroused as the first time he saw a video of a brother-sister Umbreon-Espeon pairing. Watching the lavender female get ravaged, crying out "Onii-chan! Onii-chan!" over and over, got him so hot and bothered he had to sneak outside the house to take care of his aching need without his sibs noticing.

Worse still, it made him start looking at his oldest sister, Espeon, in a new and troubling light. What was once an adorable ball of fluff was now a sleek, sexy, confident Psychic-type. Lavender fur, delicate two-pronged tail, and piercing eyes that could see your every secret. Yet despite all this, she was still just as playful, fun and supportive as she was the day she hatched. Out of all his siblings, Espeon had always been the one he was closest to.

Which only made the development of his new fetish all the more troubling. He found himself staring at his sister a lot more. He was drawn to the length of her ears and tail, the perkiness of her nipples, the curve of her ass, and the prominence of her fortune-cookie vag. She'd caught Umbreon looking once or twice, he was sure. He tried his best to guard his thoughts around her, Arceus knew if that actually worked or not. She hadn't been acting any different, so far as he could tell, but he couldn't help but feel in his gut that on some level, she knew how messed up her big brother had become.

"Hey, Bro! Can you help me with something?" Speak of Giratina, Umbreon thought, as he recognized his sister's voice. He sighed, leaving his spot on the windowsill. He went upstairs, certain he heard her calling from their master's room. A hop, skip and jump up the stairs, and he was in the lavishly decorated bedroom-bathroom suite.

"What's up, sis?" He called out, trying to sense her. There was a scent in the air, something strange yet familiar. It set him on edge, placing a gentle blanket around his brain. It was also drawing him to the bathroom, and the empty bathtub in the corner. He stepped closer. "Sis?"

Suddenly, everything took on a bluish tint, and he found himself floating off the floor. Instinctively he tried to grab onto something, but it was no use. With a yelp of protest, Umbreon was levitated up into the tub, where his sister was waiting for him. The focusing stone on her forehead shined with blue light, as he was brought down in front of her.

"About time, Bro." She purred, eyeing the Umbreon with half-lidded eyes and a seductive smile. The scent was even stronger now, an overpowering aroma that made it hard to think.

"Let me go, Sis." He protested, struggling against the psychic restraints. "I could've jumped up here just fine."

"I know you can." The Espeon smirked, approaching him. "I just wanted to make sure I could get you in here before you started panicking on me."

"Panic? Why would I panic? What're you even doing up here in the Master's Bedroom?"

"Because the room's soundproofed when the door's closed." Just to emphasize that point, Umbreon heard the door shut behind him, trapping him with his sister.

Uh oh.

"Good, you already know what I'm planning." Espeon giggled, walking to Umbreon's side, her hips and tail swaying with each step. "My heat's kicked in, and you're the only male around here of the right size, and with the right... interests." The last word was whispered into his ear, sending a nervous chill down his spine. She rubbed her nose against his neck, breathing in his musky scent. "You're sooo lucky I'm just as into onii-chan shit as you are. Just imagine how everyone would react if they knew how fucking perverted we are."

"E-Espeon," Umbreon stammered, "W-We can't do this. If I get you pregnant-"

"My psychic powers will protect my egg from your sperm." She explained, rubbing her cheek across his chest. "I'm not trying to get pregnant. I just need you to relieve me of this aching heat, and maybe have some fun with my big brother. That's not so bad, is it?"

If Umbreon could sweat, he would've done so profusely. Espeon's head dropped to his crotch, and he shivered as he felt her press her nose against his sheath, breathing deeply. "Ohhhh, that's better than I imagined." She purred, nuzzling it like her favorite toy. "Let's get the prize inside, shall we?" She licked the slit of the sheath, sending lightning through the Pokemon's veins. Again and again she licked, and slowly but surely a moist red shaft began to emerge. Her tongue began running up and down the meat, and Umbreon bit back a pleasured moan. Precum dribbled onto her tastebuds, salty and bitter.

"Mmm, just as I imagined." She cooed, licking around the tip of his dick. She could feel it throb against her tongue, filling her mouth as she took in his shaft. Umbreon's sheath swelled, and they both knew that knot was going to emerge soon.

"So tell me, brother," Espeon purred, as she turned around and repositioned her rear against his crotch, "Do you know how to take things from here? I'd prefer not to have to do all the work today." Umbreon gulped. There was no going back now, damn it. Not that he wanted to go back at this point. Hadn't he been dreaming of this for weeks now? Now was his chance.

"Okay," He sighed, "I can handle things from here. You can let me go now."

"Not until you say it," She countered, giving her a sly smile, "Out loud."

"Ugh, fine," He admitted, rolling his eyes, "'I want to fuck my sister. I want to plow her tiny little pussy with my big fat dick. I want to knot you and put an egg in your belly'. There, happy? I said the line."

She hummed happily, and Umbreon felt the bonds holding him release. Wasting no time, he grabbed onto Espeon, holding her tight. He rubbed his crotch against hers, his member rubbing around her backside, seeking purchase. He growled, pushing harder until he felt his tip slide along her slit. Ready? He thought.

"Do it." She hissed.

He kept pressing, and his dick went in. The Eeveelutions moaned together, as they exchanged their virginities. They marveled at the sensations, though Espeon definitely had the better end of the deal - not only was her needy cunt getting stretched by her brother's four-inch dick, she could also read his mind and feel how tight she was at the same time. He slid himself almost entirely out, marveling at her inner muscles squeezing him for dear life. He shoved his way back in, his sister crying happily as he hilted. He repeated the process again and again, and soon Umbreon got himself a rhythm. Soon the room was filled with the sound of Pokemon grunting and cheeks slapping.

Oh Arceus! He thought. This is everything I hoped it'd be! She feels fucking AMAZING! So fucking tight!

"Oh Umbreon!" Espeon moaned, pushing back against his thrusts, "Your cock is so BIIIG! It fills me up perrrfectly!"

Umbreon hated puns. He leaned down and bit the scruff of his sister's neck, hard. His thrusts became harder, deeper, as Espeon screamed in delight. His knot hammered her, WAP-WAP-WAP!

"Fffuuuck!" She cried, "You're so good! Mmmmph! Go faster! Faster, please!"

He didn't need any further encouragement. Using his Agility, his cock pumped her pussy like a piston, a red blur filling her with every thrust, bringing ever closer to the edge of ecstasy. Her vagina was getting loose and stretchy, and he was getting closer and closer to knotting her and reaching his own climax. Just a little more...

With a little extra pressure, his knot pushed its way in, and he hilted inside her. Tight pussy muscles squeezed his knot, and he moaned into her as he shot his warm, sticky jizz inside her.

"Yes! Yes!" She screamed. "Almost there! I'm gonna cum, big brother! I'm gonna cum! I'm gonna...aaaAAAAHHHH!" Her own climax overwhelmed her, as virile seed filled her fertile womb. Shot after shot came out, her belly beginning to swell as he emptied his balls inside his mate. A sense of relief overwhelmed the Espeon, the burning need of her heat finally satisfied, and her screams and groans fell to sighs and pants.

They stood together, bound by love and sex, gasping for breath. Umbreon licked her neck, savoring her taste, soothing the bite wound he gave her. "You feeling better now?" He asked.

"Oh Arceus, so much better!" She giggled, riding high on the afterglow. "You don't know how badly I needed that. Thank you, big brother."

"Anytime, sis." Umbreon leaned back, giving his knot a little tug. "Looks like we're gonna be stuck here for a couple minutes. You sure-?"

"I'm already blocking my egg as we speak," Espeon said, her head jewel glowing, "Master won't be back until tonight, and the others are all taking their afternoon naps. We have at least an hour to just, you know, cuddle."

"Good." He sighed, starting to groom her. "Love you, sis."

"Love you too, bro." She purred, as they stood together in the tub, bonding together in more ways than one...