One-shot Smut's Turning into series

The mirror and the growing discomfort in her clothes didn't lie. Summer adjusted her bra straps, scowling as the fabric dug into her shoulders.

"Ugh, why is this thing so tight all of a sudden?" she muttered, tugging at the clasp that seemed determined to defy her.

Beth leaned casually against the doorway, sipping from her ever-present glass of wine. "Trouble, Summer?" she asked, her tone bordering on amusement.

"It's not funny!" Summer snapped, giving up on the bra and tossing it onto her bed. "It's like… my boobs have a mind of their own or something. This is the third one this month that doesn't fit."

Beth's eyebrow quirked as she surveyed her daughter. "Huh. Late bloomer syndrome? I guess it runs in the family. Don't worry, I grew a cup size after I turned eighteen, too. Of course, mine were the result of actual biology, not whatever sketchy tech you're messing with in Grandpa's garage."

Summer flushed. "It's not tech! It's—" She hesitated, then crossed her arms defensively over her chest. "Okay, maybe I borrowed one of Rick's things, but it's under control. Grandpa said it just… jumpstarts what's already there."

Beth smirked, stepping closer. "Right. Because Rick's inventions are always so subtle and predictable. Look, if this is some desperate attempt to impress Brad or whoever, you can stop. Trust me, men barely notice boobs after five minutes unless you tape fireworks to them."

"Mom!"

"What? It's the truth," Beth said with a shrug. "And while we're on the subject, you might want to consider whether more boob is what you really want. Do you have any idea how annoying these things are when you're trying to perform surgery? Or run? Or exist in a world designed by men who think a 'large' size stops at a D-cup?"

Summer groaned. "You're not helping!"

Beth gave her a conspiratorial smile. "Fine, but don't come crying to me when you have to start shopping in the 'back pain and regret' section."

From downstairs, Rick's voice echoed through the house. "Hey, if you're gonna critique my tech, Beth, at least acknowledge the flawless molecular restructuring, huh? Those aren't just bigger; they're perfectly proportional! You're welcome!"

Summer buried her face in her hands. "I hate this family."

 "What am I going to do, Mom?" Summer wailed, finally latching the stubborn bra clasp. Her chest spilled over the edges like an overfilled balloon. "I mean, look at this!"

She spun around dramatically, thrusting the tightly packed globes toward Beth.

Beth raised her eyebrows, taking a long sip from her wine glass before chuckling. "Well, it's definitely a look," she said dryly. The white fabric of Summer's bra stretched dangerously thin over her growing bust, visibly straining to contain the newfound volume.

"Mom, this isn't funny!" Summer snapped. "It's like, out of control! I don't need to turn into some kind of—of cleavage monster right before senior year!"

Beth smirked, clearly enjoying herself. "Relax, Summer. We'll go bra shopping. Get you a couple that actually fit." Then, with a mischievous grin, she added, "Although if I were you, I wouldn't throw out the old ones. Trust me, now that your girls are all bunched up like this, the boys will definitely start to notice…"

"Mom!" Summer's face turned bright red. "I do not need this kind of attention! I've got enough to deal with—classes, training, college apps! This is literally the worst timing ever!"

Beth stepped forward, placing her hands gently on Summer's shoulders. "Honey, breathe," she said with a soft smile. "I know you're feeling overwhelmed, but it wouldn't kill you to ease up on yourself now and then. You're doing amazing, and for the record, me and your dad are already super proud of you. Okay?"

"Yeah, I know," Summer mumbled, exhaling sharply. "But still, this"—she gestured at her chest—"is getting ridiculous. It's uncomfortable, and school starts next week."

Beth nodded sympathetically. "Alright, shopping trip tomorrow," she promised. "We'll get you some new bras. Maybe a swimsuit or two for the end of summer, unless…" Beth's smirk returned. "…you're okay with wearing your old ones and flashing a bit more skin?"

"MOM!" Summer groaned, burying her face in her hands.

Beth laughed, pulling her into a quick hug. Summer squirmed, muttering something about "boundaries," but Beth only smiled wistfully. She couldn't ignore the extra softness pressed between them now. Her little girl was really growing up.

As Summer finally shooed her mom out of the room, she turned back to the mirror, eyeing her chest critically. "Boys, huh?" she muttered to herself, hefting the inflating spheres. "Yeah, too bad none of them are remotely interesting…"

She frowned, her thoughts drifting to someone far more complicated. Deep down, she knew she couldn't avoid dealing with him forever. But luckily, there was time to figure it out.

Morty wouldn't be able to ignore these babies if she let smooch them as a Christmas present.

Meanwhile, a flash of green light erupted in the garage as Morty's voice echoed through the house. "Grandpa Rick, come on! I was in the middle of something!"

"Shut up, Morty! We've got a dimensional vortex that's about to implode, and I need your dumb face to—ugh, just grab the thing! You can implode that Smith load of yours someday else."

Beth glanced out the window as Rick's portal gun flared to life, whisking him and Morty away on another adventure. She shook her head with a resigned sigh, muttering, "And here I thought today would be quiet…"

***

A shiver ran down Summer's spine as the biting chill cut through her turtleneck sweater and leggings. She trudged through the mall parking lot, her breath visible in frosty puffs. The plan had been a "quick trip," but Winter was clearly out for blood.

"Ugh, I should've grabbed my jacket," she muttered.

"You wouldn't be freezing if you weren't built like a damn skeleton," teased Nancy, her shorter, curvier friend, strutting alongside her in a snug hoodie and ripped jeans. "And I mean everywhere, not just the boob region."

"Ha, ha, Nancy. Real original," Summer shot back, rolling her eyes. "Yes, you've correctly observed, for like the millionth time, that my boobs got bigger. Thanks for noticing. Again."

Nancy smirked. "Hey, I'm just saying. You get to eat whatever you want, and it still only goes to your chest. Meanwhile, the rest of us…" She patted her hips dramatically. "We get stuck with thunder thighs."

"You're fine, okay?" Summer sighed. "And anyway, it's not like I can keep this weight. My track coach would kill me if I don't slim down by spring."

"Oh my god, are you seriously complaining?" Nancy said, throwing her arms up. "Girl, I'd kill for your problems. Like, guys are staring at you 24/7, and you're… what, mad about it?"

Summer groaned. "It's exhausting! Ever since… this happened"—she motioned vaguely at her chest—"it's been nonstop comments, stares, weird 'accidental' bumps in the hallway. I don't know how you deal with it!"

Nancy shrugged, clearly unbothered. "Easy. I take advantage. If a cute guy checks me out, I smile, maybe wink, and, boom—free coffee or an extra side of fries. You should try it sometime. Unless…" She narrowed her eyes, smirking. "You're not, like, secretly into girls, are you?"

"Oh my god, shut up, Nancy!" Summer snapped, her cheeks flushing red. "This isn't about that!"

Nancy cackled, clearly enjoying her friend's discomfort. "Relax, Sum-Sum. I'm just messing with you. But seriously, loosen up. You've got the goods now—use them! You could be having so much fun."

Summer groaned louder, rubbing her temples. "I'm not having this conversation right now."

"Suit yourself," Nancy said with a shrug. "But don't expect me to stop bugging you about it. I'm your best friend—that's literally my job."

Despite herself, Summer cracked a small smile. Nancy had been her best friend since grade school, after all. Sure, she was annoying as hell sometimes, but her loyalty was unwavering.

As they approached the mall entrance, Nancy clapped her hands together. "Alright, so, gifts. You remember what you're getting for everyone, right?"

Summer pulled out her phone and read from her notes. "Leather belt and tie for Dad, brooch for Mom, and you…" She looked up, smirking. "You're getting nothing because I'm broke."

"Figures," Nancy laughed, rolling her eyes. "Alright, come on. Let's do this before all the good stuff's gone."

The pair stepped inside, greeted by the blast of warm air and the chaos of holiday shoppers. Summer exhaled slowly. Between the crowds, the noise, and Nancy's constant commentary, it was shaping up to be a long day.

The chaos hit them the moment they walked into the mall. The foyer was alive with the seasonal bustle—overcrowded stores, screaming kids, and shoppers with the frantic energy of people who had left everything to the last minute.

"Yup, two weeks until Christmas, and it's a total zoo," Nancy muttered, adjusting the straps of her increasingly heavy shopping bags.

Summer sighed, glancing at her phone. "Alright, let's power through. We're knocking out these lists today if it kills us."

Two hours later, their arms loaded with more bags than either of them cared to count, they finally ducked into a cozy coffee shop. Spotting a newly vacated table in the corner, they dropped their haul with simultaneous groans of relief.

After queuing for a few minutes, they returned to their table with two peppermint mochas and a small slice of cake for Nancy, their moods noticeably improved.

"Guess what? I'm basically done!" Nancy said between bites of cake, scrolling through her phone. "Well, except for that stupid action figure my little brother wants. Of course, the mall doesn't have it. Anyway, now it's just the lingerie store for me—gotta find something Hayden will enjoy taking off me."

Summer groaned. "Can't we keep this PG-13 for, like, five minutes?"

"Oh, come on, lighten up! Help me out. Should I go for dark or light? Lace or satin? These are serious questions!"

Summer rolled her eyes and sipped her mocha. "Yeah, no thanks. I'm officially over anything involving underwear for the next five years."

Nancy smirked knowingly. "Ohhh, right. All those trips to get measured for bras you keep outgrowing. That collection must be getting pretty epic by now."

"Don't remind me," Summer muttered. "Feels like every month there's another one that doesn't fit anymore."

Nancy paused mid-bite, her eyes glinting mischievously. "Okay, but do you have enough of the fun kind of bras?"

Summer frowned. "What?"

"You know," Nancy teased, her grin growing wider. "The jaw-dropping, heart-stopping kind. One day you might decide boys don't actually have cooties, and when that day comes, you'll thank me for introducing you to the wonders of sexy lingerie."

Summer groaned louder, leaning her forehead against her hand. "This again?"

"Yes, this again," Nancy said with mock solemnity, then leaned forward, her tone softening. "Seriously, Summer. What's going on with you? You haven't dated anyone since… what? Tyler? That was, like, months ago. You're starting to worry me a little."

"It's nothing," Summer said quickly.

Nancy raised an eyebrow. "Is it also no one?"

"What's that supposed to mean?"

Nancy's lips curled into a playful smirk. "I think you're ignoring all the guys throwing themselves at you because there's already someone." She leaned in closer, her voice dropping to a conspiratorial whisper. "A secret crush, maybe?"

Summer's cheeks flushed. "Oh my god, Nancy. Can we not do this right now?"

"Why not?" Nancy teased, her eyes gleaming with amusement. "Come on, spill. Who's the mystery guy? Or girl? No judgment here. Wait, is it someone I know?"

Summer groaned, burying her face in her hands. "I'm going to strangle you."

Nancy laughed, sitting back in her chair with a smug grin. "Hey, best friends are supposed to pry. It's, like, in the contract."

Summer gasped, her cheeks flushing a deep pink as she avoided Nancy's piercing gaze. She fidgeted, wracking her brain for some excuse or deflection that might steer them away from this increasingly uncomfortable conversation. But Nancy knew her too well and wasn't about to let it go.

"Not at all," Summer finally whispered, her voice barely audible.

Nancy grinned, leaning in closer. "Oh, come on! You're not fooling me, Summers. Spill it."

Summer sighed, defeated. She narrowed her eyes and leveled her friend with a sharp stare. "Alright, fine. But you cannot tell anyone—anyone. Got it?"

"Sure thing, bestie," Nancy replied, though her grin didn't falter.

"I'm serious," Summer said, her tone firm. "Not a word. Ever. This is not a joke, Nancy. Nobody can know about this."

"Okay, okay!" Nancy said, raising her hands in mock surrender. "I swear on our sacred B.F.F. pact. I've never spilled your secrets, and you've never spilled mine. Ride or die, remember?"

Summer hesitated, her cheeks growing even redder. "I know, but this... this is different."

Nancy leaned back, crossing her arms. "Sheesh! Boys, huh? Always such a pain in the ass. Anyway, you were saying...?"

Summer took a deep breath and said, almost too quietly, "It's Morty."

Nancy blinked, her brow furrowing slightly as she processed the name. "Morty? Huh..." She scoffed lightly, tilting her head and tapping her chin thoughtfully. "Well, that's... interesting. Not exactly the first name I'd think of, but okay. I guess I can see it. He's kinda cute, in a geeky way. Though he really needs to do something about that hair. And maybe hit the gym once in a while—"

"Nancy!" Summer cut in, staring at her friend in disbelief. "What the hell are you talking about?"

"Your crush? Obviously."

"But I said, Morty!"

"Yeah, you did," Nancy said, shrugging casually. "Morty Crenshaw, right? That lanky dude from chem class? He's not a total disaster. A little awkward, but if you're into—"

"No!" Summer groaned, throwing her hands up. "Not Morty Crenshaw! I meant Morty Smith."

Nancy froze mid-thought, her eyes widening in slow realization. "Wait... Morty Smith? As in your little brother Morty? The kid who's always dragged along on Rick's insane sci-fi road trips? That Morty?"

Summer groaned, burying her face in her hands. "Ugh, why did I even say anything…"

For several long seconds, a suspicious silence lay at their table, though largely inconsequential in the overall din of the bustling coffee shop. There hadn't been any movement between the two young women, save for an inaudible pop of one of the countless tiny air bubbles that lingered on the surface of Nancy's warm latte.

But then it finally clicked, and in a flash,h she understood what her friend was saying.

Nancy leaned forward, her voice dropping into a hushed but incredulous tone. "Summer, are you serious right now? Your brother? That's… that's like, illegal! And also super gross!"

"He's not my brother!" Summer snapped, glaring at Nancy. Her friend recoiled slightly, blinking in confusion.

"Uh, yes, he is. Morty Smith? Your brother Morty Smith?" Nancy pressed, her tone equal parts confused and judgmental.

"No, Nancy," Summer said sharply, lowering her voice and glancing around to make sure no one was eavesdropping. "He's not my Morty. The Morty from this dimension—my brother—is dead."

Nancy's jaw dropped. "Wait, what?"

Summer rolled her eyes, frustrated that she had to explain. "Yeah, my Morty, the original Morty from this dimension, died years ago. Rick and I won't talk about it, okay? The Morty you know is from another dimension. We replaced the versions of ourselves hereafter... well, something bad happened. It's complicated."

Nancy sat back in stunned silence, trying to process the revelation. "So... he's like, not technically your brother?"

"Exactly," Summer said, crossing her arms. "He's genetically a Morty, but not my Morty. And before you say anything else, I already know how weird this sounds. Trust me."

Nancy stared at her for a long moment, then let out a slow whistle. "Wow. Okay. That's... a lot to unpack. Like, so much. But I guess if he's technically from another dimension…" She trailed off, still looking skeptical but slightly less horrified.

"Look, I didn't say it's normal or not complicated," Summer muttered, looking away. "But it's not what you're thinking, okay? He's not my brother. Period."

Nancy tilted her head, her lips quirking into a hesitant smile. "Alright, Summers. I'm not saying I get it, but... I'm not gonna judge. You've got my word."

"Thank you," Summer said, sighing in relief. "And remember: not a word to anyone."

"Not a peep," Nancy said, miming a zipping motion across her lips. "But for the record, you've got way more drama in your family than I thought."

Summer groaned again. "You don't even know the half of it."

Nancy stared at her for a moment, then leaned in with a grin that was equal parts shock and amusement. "Okay, wow. This... this is next-level awkward. But you've gotta admit, it makes sense why you didn't wanna tell anyone."

"Gee, thanks for the validation," Summer muttered sarcastically.

Nancy chuckled softly. "Don't worry, your secret's safe with me. But, uh... Are you sure about this? I mean, Morty's great and all, but isn't it gonna be a little weird?"

Summer shot her an exhausted glare. "You think?"

Nancy just shrugged, sipping her mocha. "Well, good luck, Summers. You're gonna need it."

"Yes," Summer said quietly.

"Wow... Is this, like, for real? I mean, I don't usually mention it but when I was little I had a crush on my dad, and I was for sure going to marry him one day, but that was just normal childish stuff..."

The taller teenager shook her head decisively. "That's not it, Nancy. This is for real," she said with a sigh. "I... I really want him..."

Another moment passed, filled with just the noise of holiday shoppers around them. Nancy was unusually quiet, mulling over the stunning revelation, her brightly pale face twitching slightly as she let out a few puzzling hums. Then, as she looked at her friend and saw her crimson cheeks burning with embarrassment, a wry smile crooked her pouty lips and she chuckled.

"You know, maybe it shouldn't be surprising," she mused. "That other Morty is nothing impressive but yours"--she licked her lips, grinning--"mmm, yes, he is totally yummy! A real man, that's for sure... How much older than us is he, by the way?"

"Four years," Summer answered, eyeing her friend suspiciously, "and you don't have to remind me, you know? That one day in summer, when I invited you over and we were lounging by the pool... You were practically drooling when you saw Morty come out for a swim!"

"Oh yeah, I do remember," Nancy admitted with a grin. "How could I forget that handsome face, that bright smile and the deep voice, and those nice firm muscles... And I also remember how you rolled your eyes at me when I watched him get ready to jump in the pool! But now you want all of that for yourself, huh?"

Although it seemed implausible, the blonde's cheeks somehow got even redder. "I didn't want to admit it then," she confessed, sighing yet again. "The truth was that I've been thinking of him for weeks at this point. Pretty much since he came home from college. Something just clicked when I saw him, like I suddenly forgot he's my brother. Fuck, even when I say it, I still can't stop wondering how it'd feel to, uh, you know..."

"Wow… is this, like, for real? I mean, when I was younger, I totally had a crush on my dad—and I was going to marry him one day, but that was just typical kid stuff, right?" Nancy said, her voice trailing off with a laugh as she glanced at Summer, still processing what she was hearing.

Summer shook her head decisively. "No, Nancy, this is for real." She sighed deeply, her cheeks flushed with a shade of embarrassment she couldn't shake. "I... I really want him..."

Nancy blinked, her amusement fading as she processed the gravity of the situation. They stood amid the chaotic hum of holiday shoppers, the sound of clinking shopping bags and chatter filling the air, but for a moment, everything else seemed to blur. Nancy's face twitched in thought, then a sly grin tugged at her lips.

"Well, maybe it shouldn't be that surprising," she said with a knowing grin. "That other Morty's, uh, nothing special. But your Morty—mmm, he's a whole different story. A real man, that's for sure. How much bigger is he, anyway?"

"We kinda had a sexual encounter, he nearly choked me on his dick" Summer answered, her tone dreamy and erotic. Summer raised an eyebrow at Nancy, her gaze turning sharp. "And if you breathe a word of this to anyone, just remember—my grandfather is a wanted criminal in multiple galaxies for, you know, genocide and destroying entire civilizations." She let the weight of the statement hang in the air for a moment. "So, uh, keep that in mind before you spill any secrets, okay?"

"Oh, I remember," Nancy said with a sly smile, clearly not ashamed of her reaction. "I'm not gonna spill any intergalactic secrets. Your genocidal grandpa is safe with me." She gave a wink as if the whole thing was just another normal conversation in their bizarre lives.

Summer's face reddened even more, if possible. She let out a soft, exasperated sigh. "I didn't want to admit it then," she murmured, her voice barely above a whisper. "But ever since then... I've been thinking about him, like, constantly. Something just clicked when I saw his dick. It was like I forgot he was... well, my brother." She hesitated, biting her lip, a nervous laugh escaping. "And I can't stop wondering what it would feel like, you know... to, uh..."

Nancy raised an eyebrow, her grin only widening at her friend's admission. "Ooooh, okay, Summer. I get it now. Well, looks like I won't be the only one sneaking peeks next time, huh?"

Summer groaned and covered her face with her hands, wishing she could disappear into the chaos of the mall. "Why did I even tell you?"

Nancy simply shrugged, her expression far too pleased. "Hey, what are friends for, right?"

"Was blind, but now I see," Nancy joked, her grin fading as Summer shot her a frustrated glare.

"Alright, alright, I get it," Nancy continued, holding her hands up in mock surrender. "This is serious. No Sweet Home Alabama jokes. But I gotta say, for the record, it's generally frowned upon to, you know…" She lowered her voice dramatically, leaning in. "SEX with your brother," she finished with a knowing smirk.

"As if I didn't know," Summer snapped bitterly, letting out an exasperated sigh for what felt like the hundredth time. "Look, I'm not stupid. I know it could never happen. But we're gonna be alone all Christmas break. Mom and Dad are off getting therapy, again, and Rick's gonna stay behind so he can, you know, blow up some government facility or whatever—again." Summer rolled her eyes, her voice tinged with frustration. "It's just gonna be me and Morty, stuck in this house for two weeks, and I don't know if I can survive it. Like, seriously… I'm already losing it, and I haven't even had to deal with him for five minutes yet."

She met Nancy's gaze, her voice softening. "At least now you know everything, right? So when I start thinking that maybe I can't stand it anymore, and I might need to… you know, jump his bones or whatever, I can call you up, and you'll remind me how completely insane that would be."

Nancy snorted with laughter at first but quickly realized that Summer wasn't joking. The blonde's troubled expression wasn't lost on her. She realized there wasn't much she could say to make the situation better—no snarky quip, no funny retort to break the tension. This wasn't the kind of situation that could be solved with a laugh.

But Nancy knew, without thinking too hard about it, that Summer needed support, not sarcasm. She reached over the table and took her friend's hand, giving it a gentle squeeze. Summer hesitated for a moment but let her fingers linger, appreciating the silent comfort.

It was a quiet moment, but a meaningful one. Neither of them said anything, but they didn't need to. The quiet was full of understanding.

Nancy was the first to break it.

"Huh. Come to think of it..." she mused, eyes narrowing as a new, slightly mischievous idea crossed her mind.

Summer blinked, a little wary. "What?"

"Well," Nancy leaned in, her expression suddenly serious but playful, "I mean, I said it was frowned upon, but who cares what people think, right? What really matters is how you feel about it... and what Morty thinks, of course."

Summer froze, her eyes widening in confusion. "Wait, what? Are you saying I should, like... ask him?"

Nancy couldn't help but snicker again, but this time it was a little more intentional. "No, no, silly! Do not ask him outright. What I mean is, you gotta let him know you want him, but not like that," she emphasized with a wink. "You gotta do it... you know... womanly. Subtle. Seductive. Sensuous..." She twirled a lock of her hair and flashed a sly grin. "Basically, you gotta make him see you as more than just sister material, and turn into the smoking hot chick that you are."

Summer stared at her friend in shock, her mind scrambling to process what she'd just heard. "Wait... You really think I can do that?" she asked, eyebrows furrowed.

Nancy glanced down at her friend's chest, then back up with a confident smirk. "Uh, yeah, you totally can. Especially with those assets of yours."

"Morty's not like that!" Summer gasped, horrified, only to be met with a dramatic eye-roll from Nancy.

"Okay, okay, sure, but let's not forget that Morty's, like, technically a guy," Nancy said, matter-of-factly. "Men notice things, y'know? So if you wanna stand out, you gotta highlight what you've got." She gave Summer a meaningful look. "Hey, maybe a little trip to Victoria's Secret wouldn't hurt, huh?"

Summer let out a deep, disbelieving sigh before finally cracking a smile. The awkwardness of the conversation was still there, but for the first time, it felt a little more bearable. She grabbed her coffee cup, taking a sip as Nancy did the same, both girls chuckling as they finished up their coffee.

Before long, they were back out on the mall floor, ready to tackle one more stop on their Christmas shopping spree.

---

"Damn, Nancy," she said to the supremely endowed girl, clad in only a skimpy set of red lace lingerie, "I can't believe you actually made me do it!"

The girl shot Summer an impish smile. Her hands went to the massive, perfectly round spheres that crowded the boldly cut push-up bra and threatened to spill out of its meager confines. She dug into their flesh and moaned, feeling the silky material tease her rapidly hardening nipples. Even in the bra, these magnificent globes had a noticeable weight to them, as she lifted the two cantaloupes and let them loose with a precarious but very sexy jiggle.

"Mmm," Summer purred, watching her gorgeous reflection in the bedroom mirror. "Maybe those things aren't so bad after all? If Morty likes them... God, I hope he does!"

 --

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