The Eevee family that fucks together stays together
You shuffle your little Eevee hind paws in front of the door. Everything's a little fuzzy and has been since you met that on fire dog lady that reminded you you're an Eevee morph and not a human, and that you should go hang out with your family. You don't remember them, though? You feel like you should, but... well, whatever. You will in a minute, you guess! You knock on the door and within moments it opens. On the other side is a much taller and wider Vaporeon, clad in nothing more than a white apron that's growing rapidly translucent from her natural moisture. You manage to tear your eyes away from her growing bulge and land on her absurd mommy milkers, which you finally tear your eyes away from to get to the smile on her face, and then end up scooped up off the ground and slammed face first into her tits anyway.
"Oh, you're the new little one! Mommy is soooo happy to meet you~!" she cries, wrenching you free from the cleavage you're suffocating in to suffocate you further with a deep, loving kiss. You gasp for air and sway on your paws, instinctively gripping her hand as she leads you further into the house. "Everyone! Water Mommy has a new daughter-sister to introduce yourselves to!" she declares. You hear several doors opening and the sounds of paws shuffling. The first two to enter your field of vision are a Flareon and Jolteon, figures equal to your new water mommy's. Flareon dressed in an immaculately ironed and cleaned sun dress, Jolteon in little more than a sporty bra and pair of shorts in an attempt to show off her abs through her spiky fur. "Cute little thing. Be sure to do your chores." Fire Mommy speaks first.
"And come exercise with me when you're done! I'll getcha strong enough that we'll see what a fighting-type 'Vee looks like!" Electric Mommy laughs, patting your head. You blush, uncertain where you should be looking right now with the trio of mommies surrounding you. Four more make their way into the living room now. Their figures aren't quite so extreme so you assume that they're big sisters instead of mommies, though that doesn't make it any less hard to stare. The first to say anything is the Leafeon, clad in an oversized tie dye shirt and nothing else, her fat balls and untrimmed foliage hanging out from the bottom of it. An unlit joint rests between her lips, though her eyes are so red you're sure she doesn't need it. "Heeeey... lil' dude... you wanna have a, uh... smoke sesh?" she manages to ask.
"Ugh! Give her time to settle in before you try to bake her brain!" the Espeon responds, grabbing you and hugging you into her face first into her cleavage, leaving your paws dangling in the air as you get high on biggest sister scent instead. "Take your own advice." the Umbreon, clad in a flowing gothic dress responds, gently pulling your head out of the Espeon's cleavage so you can breathe, and witness the two of them glaring daggers at each other. You can feel eldest sister's cock stirring against your thighs. "Welcome to the family." the final big sister, Glaceon, speaks up while patting your head gently. "You'll get used to it soon, I'm sure. Especially since a domino effect is about to occur." she finishes, unbuttoning her blouse and stepping out of her skirt. You blush, again.
You fall to the floor and feel Espeon's cock the whole way down, harder than a steel-type. You look up and see your entire family sporting identical erections, each stripping out of their clothes. "We really have to stop doing this." Fire Mommy grumbles. "Then stop humping my thighs, sweetie~" Water Mommy responds, grabbing a handful of Fire Mommy's mane and pulling her in for a passionate kiss. Electric Mommy picks both of them up in her strong arms and starts grinding herself against whatever is closest. You watch your entire new family fall into an impromptu incesteous orgy, flushed and shaking with embarrassment and arousal, your own cock and pussy leaking through your shorts and leaving a puddle on the hardwood floor. Your blazed Leafeon elder sister stumbles over to you and starts grinding her cock against your face. The scent of weed and other assorted grass overwhelms your senses and without realizing what you're doing you catch the tip in your mouth, drawing a moan from her. "Daaaamnn... lil' sis got a nice mouth..." she laughs to herself.
You don't know when your Umbreon and Espeon older sisters scooped you up off the floor, though not so high that you have to stop sucking on Leafeon's. "So inconsiderate. It's her first day, use her other hole!" Eldest Sister huffs, before filling you to capacity with her cock. "Just admit you want to fuck your little sisters, bitch." Umbreon rolls her eyes, and you find out that you're twice as stretchy as you thought as she slams herself down to the hilt inside of you as well. Your vision goes white around the edges and thought gets harder. Memory fragmented. You remember flashes of your family taking turns with your holes, getting impatient and stuffing multiple cocks into each of them, into each other. You're pretty sure you came inside of Water Mommy? The only thing you're certain of is... love.
Every rope of cum that blasted inside of you to leave you with a belly that already looks incredibly pregnant was filled with the love your new family already has for you, the unconditional affection of your weird bunch of Eeveelution sisters and mothers. You lay in the center of the post-orgy cuddle pile, surrounded by still half-hard cocks and soft bellies so full of life that you know for a fact you're about to have dozens more sisters. Everything's been fuzzy, but you know for a fact you've never felt like this before. Cared for. Loved unconditionally. Adored. It makes you just... just...
The thought ceases as you wake everyone up out of their cum coma by glowing brightly. Everyone's gaze remains firmly locked on you as you grow to match the height of your big sisters. Tits grow bigger. Hips wider. Cock and balls fatter. A pair of ribbon antenna arm things grow out of you as your fur takes on the colors of the trans flag. A giddy joy fills your mind, a desire to feel your body moving, other's bodies moving against yours, music pounding. The light explodes out into sparkles as you lay there, now a Sylveon, squirming with excitement and wrapping your ribbons around your new family. They fall into a chorus of congratulations, tight hugs, and cocks growing hard against your newly fat thighs yet again.