A tale of two sisters

The scent of buttered toast filled the kitchen. Amy sat across from me, her bare feet dangling just above the floor as she nibbled on a corner of her toast, eyes following Mom leading Dad out of the house. "I'm not gonna lie, I didn't get that much sleep last night," she commented, her voice tinged with a pleasant exhaustion. She yawned and stretched her arms over her head, her t-shirt riding up enough let me glimpse her flat stomach. "I could really go for a nap before class."

"Really? We have the house to ourselves and you don't want to fool around some?" I said with a smirk, running a finger along the inside of her naked thigh.

"Gross. You're my brother," she replied, gagging playfully but making no move to stop my hand from creeping further up her leg. "This isn't some porno."

"Right," I replied with a laugh. Amy glared at me and my smile faltered. Was she serious right now? "But... you were super into fucking dad last night. You even made out with mom a bit..." I said in confusion.

"What does that have to do with anything? He's a dilf, she's a milf. Of course I want to fuck them," she shot back exasperatedly, as if that were a logical argument. "You're just my little brother. I'm happy that you want to use me, but don't read some weird brother-sister shit into things."

"But we live together, so we can fuck anytime we want. Being your brother should make it even hotter! So what if we're not supposed to fuck? That shouldn't matter. It would be a waste for you not to," I half yelled, my voice echoing slightly in the kitchen. As I said that, I watched her expression change, first shifting from disgust to eyeing up my naked body, then to chastened, like I had made a good point and she hated to admit it.

"You're right, bro," she said. "But later. Right now, I just need to sleep," she added. I watched as she walked away, bare ass just covered by the tail of her shirt. I did the dishes, my mind spinning, trying to catch up with the rapid-fire changes in her thoughts and feelings. One second she had been looking at me like I was a sicko for suggesting she might want to fuck me, the next she agreed that we should like it was obviously true. I hadn't meant to, but I had used her. Shit, that had been too easy. If I wanted to talk about politics or what to have for lunch, would everyone end up agreeing because I inadvertently said they should?

I made my way upstairs and down the hallway, the morning light filtering through the blinds, casting long shadows across the floor, and pushed open Amy's bedroom door quietly, not wanting to wake her if she was asleep. Sure enough, she was already sprawled out on her bed, sheets covering her body, her huge breasts forming a large, soft tent in the fabric. She looked so peaceful, laying on her back, the soft light seeping around the blinds lending her skin an ethereal quality, her dark hair fanned out across the pillow and her lips slightly parted, snoring softly, her massive breasts rising and falling with each breath. I yanked the sheet off to get a better look, noting that her 'oversize' t-shirt failed to cover much, the massive mounds of her breasts leaving too little fabric left to cover her flat stomach or bare mons, her smooth legs seeming to go on for miles. I knew that she needed her sleep, and I wanted to be a good brother, so I reluctantly began to pull the sheets back up when an idea struck me.

"Hey, Amy," I said, quietly. "Until you your alarm goes off, there should be two of you. One of you can sleep, in fact nothing can wake her until then. The other should be awake and rested."

I waited, holding my breath. And then her body began to ripple, like waves under her skin, which bulged outwards as if a bubble were rising in water. It expanded, then fell to the side, stretching like taffy, and with a snap there was a second Amy beside the first on the bed. This new Amy was naked and identical to the first, except that her breasts were smaller, just like they used to be before I had had her grow those larger ones.

The second Amy stretched lazily, her eyes wide open and alert as if she had just risen from a satisfying nap, and then noticed I was staring at her. "John?" she said, a bit of sleepiness still clinging to her voice. "What are you doing here? Come on, bro, I was trying to sleep. We can fuck when I get home. Didn't you just fuck mom all night? Are you still so horny that you had to use me right now?" she asked, stretching enticingly. "I must not have been as tired as I thought," she added, then she put her hands down, and one landed on the breast of the other Amy in the bed next to her. "What the fuck?" she cried in shock, turning to see herself still asleep.

"I thought it would be fun if there were two of you," I said, my voice steady despite the excitement coursing through me. "One can sleep, and the other can... well, do whatever she wants."

The new Amy blinked, her eyes widening as she looked down at herself sleeping, then at her own body, cupping her smaller breasts, then grabbing the huge ones rising slowly up and down next to her with a hint of confusion on her face.

I climbed onto the bed, my heart pounding with anticipation. The awake Amy's smaller breasts looked almost dainty compared to the massive ones of her other self. I grabbed her cute boobs, fondling her, enjoying the feel of my hands completely covering them.

"John, what the hell?" she said, trying to shoo me away. "Not here. She... I... what if you wake her... me up?" she asked, a bit confused by the whole situation.

"Relax," I said, my voice low and husky. "She won't wake up no matter what we do. That's how I'm using her. Watch this," I added, leaning over my sleeping sister. "Cum for me, sis," I whispered into the sleeping Amy's ear.

The sleeping Amy's hips arched as she immediately let out a soft moan. Her hands tangled in the sheets, legs rubbing together, breathing hard, but she didn't awaken from her sleep. Lost in whatever dreamy was playing out in her mind, completely oblivious to the two of use watching, her sleeping body thrust at an imaginary lover, tits shaking as she cried out softly before settling back into a peaceful and, judging by her smile, pleasant slumber.

"John... that's... fuck...," the other Amy whispered, her voice barely audible, her eyes wide with a mix of shock and arousal as she unconsciously ran her hands over her body, fingers playing across her slit as she watched herself cum. "Well shit. I don't have anything else I need to do, and I don't need to sleep, so not fucking you would be a waste of my morning," she said, grabbing my hard dick, her voice determined.

"Fuck, Amy... I love it when you say things like that," I groaned in response, my hips bucking, thrusting into her grip.

"You want a tit fuck?" she asked with a smirk, leaning down, hands cupping her smaller breasts, squeezing them gently around my length. "Do you like them? Are they too small?" she asked plaintively. "Kinda funny. Making them bigger was one of the first ways you used me, and I remember them feeling strange at first, but now these feel off."

"Yeah, sis... just like that," I nodded eagerly, my breath hitching in my throat, my eyes following her small, perky breasts as she guided my dick between them. "Sure, I like em bug, but they're still your boobs. It wasn't that you didn't have awesome boobs before, I just wanted to try using someone like that."

"Awesome boobs, huh?" she said with a grin, and began side her breasts along my shaft, her dark hair cascading around her shoulders. Her tongue darted out to lick up and down the length of my dick that thrust beyond her cleavage, her eyes locked onto mine with a mix of mischief and desire. Beside us, the sleeping Amy slept on, her massive breasts rising and falling with each deep breath, completely oblivious to what was happening beside her. My eyes wandered from my sister's original breasts wrapped around my pole, thrusting up and down around my shaft, to her altered breasts slowly rising and falling.

"Fuck, sis... I'm gonna cum," I groaned, my hips bucking involuntarily.

"Cum for me, John. Let me feel you cum between these tits. I wonder if it will feel different. I never did this for Matt," she said, her eyes dark with desire. With a final thrust, I came, my release painting her chest and face. She moaned softly, her small breasts jiggling with each shudder that wracked my body.

"That was... incredible," I whispered, my voice hoarse as she licked some of my cum from her hands before the rest vanished.

She leaned forward, pressing a soft kiss to my lips. "Yeah," she agreed, her breath warm against my mouth. "But we're not done yet. I don't have to get ready for class for a while, and it would be a waste not take further advantage of my little brother's hard dick," she added, glancing at her alarm clock. She leaned down and took me deep into her throat, then popped back off. "Does it turn you on? One of me asleep while another is sucking your dick?" she asked, fisting me, swirling her tongue around the head before swallowing me again.

"Fuck yeah, Amy. It's so hot," I groaned, my hands on her head as I thrust into her mouth. She hummed in response, shutting her eyes for a moment as she focused on pleasuring me. Her free hand reached out, making the the sleeping Amy moan softly as she squeezed one of her massive tits. I came in her mouth, and she swallowed all of it, then demanded that I return the favor, and I happily licked her until she came on my face.

She pushed me down and straddled my hips, facing away from me and plunging herself onto my dick, ass jiggling with each hard thrust as she played with her other self's larger boobs, bouncing and smakking them. "You like that, don't you?" she panted, her voice tinged with excitement. "Your sister fucking you while she sleeps at the same time?" I could only grunt in response, my hips bucking to meet her thrusts. It didn't take long until I flooded her tight cunt with my cum, as she twisted her other self's nipple, cause her to gasp in her sleep. Amy flipped onto all fours, her small ass pointing at me, laying atop her sleeping form, large breasts pressed against small ones. I took the hint and grabbed her hips, pounding into her from behind. The sleeping Amy let out another soft moan, her body shifting about, but she never woke as I fucked her other body into her.

Amy's phone started playing a pop song. She let out a soft cry, her body tensing around my dick as she came, collapsing against herself, her breath coming in ragged gasps. I kept thrusting into her, the **** of my thrusts driving her forward, into her other self, and the two versions of Amy merged together, their bodies blending seamlessly into one. Amy's head sank into those huge breasts, followed by he smaller breasts, as each limb snapped together, and I found myself thrusting into one Amy's pussy as she woke with a start.

"FUCK! YES!" she cried out, her voice tinged with surprise and pleasure as she felt me cumming inside her, my breath coming in ragged gasps as I tried to catch my breath, massive tits cushioning me. The alarm was still playing. Amy moaned lazily, her body arching under mine, thrusting up on my dick to milk the last of my jism out of me. She reached one arm out blindly and, after a few tries, managed to silence the music, then pushed me off of her, throwing me to the side, my dick exiting her depths with a squelching sound.

"Can you use me like that more often?" she said, her voice tinged with excitement. She sat up, her hands cupping her massive breasts. "Hey, why were they smaller?" she wondered aloud, hefting her enormous bosom with a look a both contentment and a regret on her face.

"I don't know," I said, my voice hoarse.

"Well, that was... an incredible way to spend the morning," she whispered, her breath warm against my mouth. "But I really do need to shower before class." She gave me a playful shove off the bed, her massive breasts jiggling. "So either make another of me to go, or get out and let me clean up before class," she added, and I couldn't tell which option she preferred.