Serena sighed softly to herself as she slipped back in the door, letting her bag fall to the ground with a dull thump as she leaned against the doorframe, winding her tail around her waist and letting her body relax. Spring vacation had finally arrived, and the teenaged catgirl was planning on enjoying every moment of it.
	The loud thump had been heard, naturally, and very soon her sister Mika was by her side, her long tabby-pattern tail swishing behind her. “Big sis, are you okay?” she asked, staring up at her with worry in her green eyes.
	Serena forced a smile and reached down to stroke Mika’s ears. “Yeah, it was just a long day,” she murmured, sitting down with her back supported by the doorframe and looking out at the dandelions starting to peek up out of the lawn. “But school’s over for a whole two weeks now…”
	Mika smiled and knelt by her sister’s side, purring happily as she felt those gentle hands on her ears. “And how about her?” she asked, laying her hands reverently on the round swell of Serena’s stomach.
	Serena blushed a little and glanced away from Mika. “Getting hard to carry… but it’s okay,” she murmured. “Actually… about my baby, I have to tell you a secret about that…”
	Mika peered up at her, mewing a little and flicking an ear cutely. “A secret?” She rubbed her face a little, and Serena’s eyes were drawn to a red mark on her cheek. “What kind of a secret?” She giggled. “You know I don’t keep secrets too good, big sis…”
	Serena frowned. “First… what happened here?” she asked, her white-furred tail flicking up to stroke along Mika’s cheek. “Don’t tell me she got mad again…”
	Mika froze, and pouted, nuzzling into the soft tail. “I was bad,” she argued. “It’s my fault Mommy got too mad at me.” She tried to clamber into Serena’s lap, mindful of the pregnant swell. “I-I’m okay now, though…”
	Serena’s frown only deepened. “Is that really the only place she hit you?” she asked sternly. She knew her mother wouldn’t be home, not for a while yet. “Tell me the truth, Mika…”
	Mika mewed sadly, and pulled up her shirt to show a pair of marks on her back, both a decidedly more angry shade of red. “I made Mommy really mad…” she mewed. “I broke that special vase of hers… I tried to put it back together, but she noticed and got real mad…”
	Serena tensed, pulling Mika closer and licking gently over the mark on her little sister’s cheek. “That doesn’t give her the right to hurt you, just because something broke,” she murmured. “You’re a person. That dumb vase of hers isn’t.”
	Mika began to purr softly again, closing her eyes and relaxing as her sister’s rough tongue trailed over her cheek and soothed the stinging. “You’re so good to me, sis,” she murmured. “How come Mommy never does this to you, though? I mean…” Her eyes wavered a little. “Am I just a really bad girl?”
	Serena slowly stood, careful of both her own swollen belly and the little catgirl nestled in her arms. “No, silly,” she purred gently, continuing to lick. “Mommy’s just scared she’ll hurt my baby if she tries to hit me… and if she did that, she would go to jail for a very long time…”
	Mika clung to Serena and mewled, nodding. “S-so… what’s the secret? About your baby?” She nuzzled in, closing her eyes again.
	Serena pushed the door closed with her tail and began to climb the stairs, though with obvious difficulty with both Mika’s and the unborn kitten’s weight on her. Soon enough, though, Mika was curled up on her sister’s bed, purring away. “Well,” Serena began, closing the door gently. “First… you know how you never feel my baby kicking?” She fidgeted. “There’s a reason for that…”
	Mika looked up at her sister through half-lidded eyes, already relaxed. “Isn’t your little kitty just sleepy all the time?” she murmured. “That’s what you told me…”
	Serena shook her head. “No… that’s not it…” She laid a hand on her belly. “The truth is, there’s not an actual baby in there… my body’s just getting ready for something special…” She knelt next to her bed, slipping Mika’s shirt up again and starting to lick over the bruises there.
	Mika began to purr in earnest now, her tail stroking affectionately against her sister’s cheek. “But… you’re gonna have a baby in there soon, right?” she asked. “I mean, you’ve got a big round belly… it’s got to be getting ready for a baby, right?”
	Serena blushed, continuing to lick. “Y-yes, it is…” she murmured, watching and slowly, gently sliding her sister’s shirt off entirely, the little one laying topless and on her stomach now. Mika didn’t seem to notice, soothed by the rough tongue against her stinging bruises. “I’m going to have a cute little baby girl in my belly…”
	Mika purred and giggled softly. “You’re gonna look real pretty, sis…” She swished her tail gently, peeking up at Serena. “What’re you up to, big sis?”
	Serena blushed anew. “W-well… Mika, will you trust me? There’s something I want… no, I have to do… but I need you to trust me and do what I say, okay?” She shivered. I can’t leave her here any longer. Mom’s getting worse every day… and now we have two whole weeks open to us. It’s got to be now.
	Mika rolled over and leaned up to kiss her big sister’s cheek, nodding. “Of course I’ll trust you, big sis,” she murmured, nuzzling gently closer to her. “Just tell me what I gotta do. Even if it sounds weird to you. I know you want to help me…” She purred and licked the bigger girl’s cheek.
	Serena wrapped Mika in her arms and smiled, kissing the very tip of both of the girl’s ears. “Okay…” She blushed a bit. “Well… first you have to finish getting undressed…” She set Mika on the bed again and moved back to give her a little space.
	Mika blinked, but nodded, remembering the promise she had just given. Soon her cute little skirt was folded on the bed, and with a wiggle of her bum she tugged off her socks. “Do I gotta take off my undies too?” she asked.
	Serena bit her tongue. What she was about to do would go more smoothly with Mika totally naked, but she could see the girl was uncomfortable already, so… “No, it’s okay,” she said soothingly, gently undoing the buckle on the belt holding up her jeans. “Now just close your eyes and wait… I’ll do the rest…”
	Mika purred a little and covered her eyes with her hands. “No peeking!” she vowed, sitting cross-legged on the bed in just her little panties and waiting.
	Serena blushed happily, gently letting her jeans fall. Beneath she wore no panties of her own, and her nethers were already a bit wet, making Mika’s nose twitch. With a smile, the older catgirl stepped closer to her little sister, running a hand over her ears and purring as a long cord slowly began to lower itself from her nethers, growing longer and longer as she imagined what would soon happen between the two of them…
	When the cord was almost three feet long, she knew it was time. “This is gonna sting, just a little bit,” she warned, lifting the end of the cord and pressing it to Mika’s belly. “Almost like getting a shot…”
	Mika pouted a little, and mewed as she felt a momentary pain in her bellybutton… and then began to purr happily, instinctively nuzzling up against Serena’s swollen belly. “It did, but now it feels really nice… what’d you do, big sis?” she murmured.
	Serena lifted the little catgirl easily, slowly laying herself down on her bed. “I-I’ll explain soon,” she mewed. “Just relax for now, though. Even if it feels weird, okay?” Carefully, she laid Mika down between her legs, sitting up and taking the girl’s feet, hesitantly pushing the big toes into her exposed slit.
	Mika wiggled a little, and began to purr. “O-okay… oooh, warm…” she murmured, wiggling her toes and pushing them forward, enjoying the warmth of Serena’s body as her feet began to disappear inside of it.
	Serena purred happily and nodded, watching in wonder as Mika slowly vanished up to her ankles inside of her soft body. “It’s going to get even warmer… so warm and nice…” she purred. “I-I hope you like it… and you don’t get mad when I do understand…”
	Mika giggled and relaxed, letting her sister move her forward now. “As long as you’re not trying to gobble me up,” she teased. “But I know my big sister would never eat me.”
	Serena giggled, her body growing a bit warmer around Mika’s as the younger catgirl’s legs began to disappear inside of her, every wiggle bringing her such pleasure. “Of course not. I would never eat my sweet little sister…”
	Mika nodded. “Serena is my big sister. Doesn’t matter if her Mommy adopted me. She’s so good to me…” She giggled. “Wow… it feels like I’m going into a warm sleeping bag…” She suddenly yawned. “I’m sleepy, big sis…”
	Serena blushed and nodded, reaching down to stroke those tabby-striped ears, so different from her own Angora fur. “I know. You just take a rest…” She mewed gently, her slick flesh parting and sliding down over Mika’s hips. The little kitty girl purred happily at the warmth and wiggled, bringing even more joy to Serena as she began to work the top half of her little sister into her moist canal.
	Soon enough, Mika was fast asleep, the incredible warmth and softness of her big sister’s passage making the tired kitty doze off. Serena continued to watch Mika vanishing slowly into her body, her hands by her sides as she allowed just her muscles to move, working over the girl’s body gently in a rhythmic pulsing motion, first squeezing gently around her and moving back, pulling her with them, and then releasing gently as they slid out, ready to pull anew.
	After perhaps ten minutes of this gentle bliss, Serena felt a strange pressure deep inside of her, and mewled gently, knowing exactly what it was. Mika’s feet, deep inside now as the lips of Serena’s slit squeezed around the kitty’s navel, were now pushing against the hard, tightly sealed ring of her cervix. Purring gently, Serena closed her eyes, focusing inward just as she had been taught, letting the pressure slowly coax her body into opening up. With a sudden jerk, Mika’s feet popped past the cervix, making Serena meow in surprise as she slumped back against the pillows, eyes wide as her tail squeezed itself around her leg. Mika stirred within her, the sudden movement having tugged her even deeper, so that her chest was covered in warm soft flesh, but then fell back to sleep.
	Serena blushed, and nodded, her womb making good use now of the preparations she had made. Even though Mika’s head was free still, the cord in her belly began to swell, feeding air and the last remnants of the huge lunch Serena had eaten at school into the kittygirl’s body. As Mika sank deeper, only her head free now, her feet began to push against a soft, yielding surface. Serena mewed softly and ran a hand over her belly… the gravid form created simply by a warm, soft sac filled with fluid that had slowly grown over the months since she had met Jacob. Now, the membrane surrounding it gave slightly, small amounts of fluid spilling out as it parted and pulled Mika’s feet inside. The little girl mewed softly in her sleep, wiggling a little as she felt her environment getting even warmer and the little bits of liquid trickling down around her.
	Serena blushed, knowing it was the final stretch now… as Mika’s head began to enter her nethers, the catgirl’s tail slipping down to stroke over her cheek as it also helped to gently push her inside. Every contour of her little face was evident to Serena as her body entirely enveloped her little sister. “M-mine…” she mewed, feeling her nether lips close over those pointed ears, hiding all traces of Mika from the outside. There was nothing to do now but wait… letting her belly swell out even further as Mika inched her way through the wide-open cervix, passing through the membrane and into Serena’s fluid-filled womb…
	It was nearly done when the window opened and Jacob stepped through, blushing as he caught sight of her closed nethers and the gravid swell to her belly. “You really did it?” he asked, twitching his coal-black tail.
	Serena nodded, blushing and running a hand over her belly. “H-her head’s going into my cervix right now…” she murmured. “Soon she’ll be held inside…”
	Jacob laid his hands on her belly, wrapping his tail around hers. “Have you told her about our plans yet, Serena?” he murmured.
	Serena fidgeted. “I was going to, but she fell asleep while I was taking her in…” she whispered. “So I haven’t yet…”
	Jacob smiled softly, running his hands over her. “Let’s wake her up then… we’ll tell her together.” He grinned. “After all, I helped with this whole scheme too…”
	Serena gasped as Mika suddenly began to wiggle inside of her, a last trickle of fluid splashing out onto the bed as the membrane closed up around her. “S-sis?” her muffled voice came from inside. “Where am I? It’s all wet, and stuff… it’s so warm though…” The voice paused. “H-hey… I hear something, like a drum… is that your heartbeat, big sis?”
	Serena blushed and laid her hands against Mika, nodding. “Y-yes… Mika, remember when I told you I was going to have a baby inside of me? But that I didn’t have her yet? Th-that’s because you’re going to be that baby…”
	Mika began to wiggle a bit. “You’re gonna be my mommy now, big sis?” She pushed against the walls. “I-I don’t get it… where’m I? In your belly? A-and… how can you be my mommy when I’ve already got one?”
	Serena tensed, sitting up and hugging her belly tightly. “That mean lady wasn’t really a mommy to you,” she whispered fiercely, her voice carrying easily through her own body to Mika. “She was mean and she hit you, and she wasn’t what a mommy is supposed to be… so I’m going to be your mommy now. A real mommy, not just one who adopted you…” She blushed. “Jacob and I found out a special way… a magical way to make you into our daughter… and I just couldn’t leave you here with her any longer…”
	Mika blinked. “Are you gonna run away?” she asked, eyes wide as she moved around inside the fluid. “H-hey, how am I breathing? I’m underwater…”
	Serena smiled. “I’m breathing for you. Through that cord… that’s why it feels so good. Because you’re attached to your new mommy…” She purred. “And yes, I’m going to run away. With Jacob, and with you… we’re going to live happily somewhere, the three of us together…” Her tail coiled around Jacob’s and gave it a squeeze lovingly.
	Jacob grinned and put his ear to Serena’s belly. “Like the sound of that idea, Mika?” he asked. “I know you’d never turn down Serena as a mommy… but you sure you’re okay with me being your new daddy?”
	Mika giggled. “You’re nice, silly Jacob,” she teased. “Besides, it’s okay… I wanna run away with you both. And have a real mommy…” She yawned. “M-mommy Serena… how come I feel tired?”
	Serena cooed and stroked her belly. “I have to do some things to make you totally my girl,” she said softly. “Special, magical things that’ll make you into my beautiful daughter…” She kissed Mika through the swell of her stomach. “Just sleep. Mommy will be here when you wake up…”
	Mika giggled. “Mommy’s gonna be there when I sleep, too! All the time until I’m borned again…” She yawned and curled up, wrapping her tail around herself. “I love you, big sis… you and Jacob can absolutely make me your kitty…”
	Serena smiled, standing and carefully dressing herself in a long maternity gown. “It’ll take a while,” she murmured to Jacob. “She’s almost seven, after all… most do this before they’re four…”
	Jacob smiled. “We’ll wait, then,” he said. “It’s not like you aren’t beautiful with Mika inside your belly…” He kissed her softly and slipped out of the window. “Now c’mon… we’ve got a running-away to pull off.”
	Serena smiled and nodded, rubbing her belly. A few moments later, she too was gone, leaving only a neatly-written note in the small puddle of amniotic fluid that lay on the bed, a tiny leakage from the vast amount that would cushion Mika until she was born…

In the end, it turns out I was right. It’s not my fault you were such a bad mother to me… it was yours. You proved that every time you laid a hand on my little imouto. So now her sister is going to take her away and become her loving mother. Don’t bother looking for her… she’ll look a lot different once she’s my daughter. Goodbye, mother. I’m off to become a much better mother to Mika than you ever were.