To Me, You're You; To You, I'm Me
"Wh-what? Say something!"
Even with her chest fully exposed, Mari yelled out in a high-pitched squeak at her friend, who just stared silently at her breasts. This wasn't the usual energetic and confident Seo-yoon. This was the droopy, listless version that only showed up during her periods. Mari had known her since they were kids, always stuck together, so she could tell. This side of Seo-yoon wasn't something you saw every day.
No matter what happened, she handled everything with composure and always extended a hand if you needed help—that was the usual Kang Seo-yoon. But...
"Th-then... just a little..."
Seo-yoon gulped. Just two days ago, hadn't they been tangled up, bodies pressed sticky and close? Back then, she'd wrapped her arms around Mari's neck, kissing desperately, and at the peak, she'd locked her legs tight around her waist...
Seeing her so tense and embarrassed now made Mari feel oddly self-conscious too.
"Then... should I touch?"
It wasn't often she showed this soft, vulnerable side, like exposing her tender flesh. Mari cautiously reached out, her fingers brushing Seo-yoon's soft breast, and she flinched visibly. Whether to avoid hurting her or not, Seo-yoon had completely relaxed her strength as she began kneading. Watching that, Mari's chest tickled inside.
"...You grabbed my dick so boldly, shoved it straight in your mouth without hesitation, but my tits? You're touching them all careful-like?"
"Dicks are fine, but tits..." Seo-yoon averted her gaze slightly as she said it.
"Tits are sensitive..."
"Hmm, so Seo-yoon's tits are sensitive, huh? I'll remember that."
"Huh? Wh-why would you remember that...!"
And yet, Seo-yoon didn't stop kneading her breasts. At times like this, she really seemed like a guy. Even when her dick had suddenly sprouted, she'd been a little surprised but stayed calm throughout, and somehow she knew all the good spots on it too. No matter how much she'd researched, could you really figure that out?
"Come to think of it, even when we did it, you never really groped my tits much."
"Yeah...?"
"Maybe from now on, we can pay a little more attention to them together."
"...Yeah?"
Seo-yoon met her eyes again. Were her ears red from the pain, a fever, or just embarrassment? She tried to play it cool, but she was easy to read—her friend Kang Seo-yoon.
"You like tits that much?"
Mari asked wonderingly, watching Seo-yoon keep at it despite her ragged breathing from her poor condition. Her eyes were half-closed, like she could drop off to sleep any second, but her hands never stopped caressing Mari's breasts. Growing more familiar, her touch now traced the areola softly before zeroing in clearly on the nipple.
"Of course. Who doesn't like tits?"
"Seo-yoon's are big too."
"Feels different from touching mine."
"So you've touched yours solo, huh?"
Seo-yoon paused for a second, then ducked her head again. No answer, but that was answer enough. No wonder her technique felt pro-level.
Probably 'cause Seo-yoon's the type who likes getting penetrated. If she'd grown a dick instead, she'd probably be pounding away non-stop while groping tits the whole time.
"Hng...♡"
Little by little, the thrilling sensations from her areola and nipple started heating Mari up too. At first it was just ticklish, but now every brush of Seo-yoon's fingers sent electric jolts of pleasure. Weaker than what came from her dick, but a different kind—refreshingly new.
"Hehe..."
"Y-you're... way too good at this, aren't you?"
Mari had started living with Seo-yoon just before New Year's after Christmas, so barely a month now. Learning these new sides of her friend she didn't know before felt joyful, yet strangely complex. Realizing there were things only she knew about her made her lower belly tingle. A different kind of 'heat' from the good feeling of her dick getting hard.
If she had to compare, it was like the emotion she'd felt first seeing Seo-yoon sprawled beneath her, panting.
"..."
But her condition was what it was—she couldn't fight the sleepiness. Seo-yoon's movements slowed, then faded, though she kept her hands on the breasts right up to the end. Amazing.
"Seo-yoon, sleepy?"
"Mmm..."
Mari chuckled at her babyish mumble in her drowsy haze and pulled her into her arms. She felt Seo-yoon's face squish—splat—into her huge breasts. Maybe from her mom, who'd been a model in her youth, but compared to girls their age, hers were really, insanely big and perfectly shaped.
Her Korean dad had seen her mom's photoshoot spreads and fallen so hard he'd booked a flight straight to Japan where she was shooting. Swept up in his youthful passion, her mom had fallen in love too. After a few hot years of dating, Mari was born. She quit modeling after that to become a housewife, but her beauty was still stunning.
Mari didn't match her mom, but her mixed heritage gave her an indescribable allure that always drew eyes. Even in casual clothes on weekends back in school, she'd get casting offers. They'd freak out realizing she was underage, but that just meant she was that captivating.
"Heehee..."
"Like it that much?"
"Yeah... Mari... so nice..."
Seo-yoon buried her face in the ample chest, and soon her breathing turned to soft snores as she fell asleep. Mari gently stroked her sleeping friend's hair and let out a small sigh.
"Haa... Kang Seo-yoon, seriously..."
Lots of guys had hit on her, and sometimes girls too, blushing as they approached. But she'd brushed them all off, and the ones left by Mari's side were just Seo-yoon in her arms now and their other friends.
Was this tickling in her chest mere friendship, lust for the girl she'd shared her body with, or something more? Having never dated, Mari had no clue. Her first time had been with a guy, sure, but with Seo-yoon, even more so.
But one thing.
"Aigoo..."
The 'gratitude' toward her friend who always pretended otherwise but looked out for her—she could name that clearly.
"Sleep well."
Mari lightly pinched Seo-yoon's cheek, stretching it boiiing, then pulled up the blanket. Her body was warm, which hurt less anyway, and with Mari's chest out, it was getting chilly. Even asleep, Seo-yoon kept her face buried and lips smacking, so she couldn't pull away.
Glancing at her phone nearby, delivery wouldn't be here for a while.
"Bad sleeping habits, seriously. You're quiet at night..."
Watching her friend now sucking on her breast, Mari thought: I gotta try sucking Seo-yoon's tits later too.
"Uggggh!"
I yanked back the curtains, basked in the bright sunlight, and stretched out my stiff body. Finally, my period was over—felt so much lighter.
"February already, huh..."
"Ugh, what time is it?"
"Uh... 9?"
"Yeah? Guess we should get up then..."
Mari crawled out from under the blanket, yawning hugely as she loosened up. Plop, her belly fat poked out, all soft and jiggly.
Cautiously, I reached out and poked—squish, it sank right in.
"..."
"..."
I quietly pulled my hand back.
"Kang Seo-yoon!!!"
"Kyaaang!"
I couldn't dodge the flying back-smack, but it was my fault, so I took it meekly. I'd wondered and poked, but damn, it was that soft...!
With all the tteokbokki and mala tang I'd scarfed during my period—plus everything else—Mari must've gained too.
"Huff, huff...!"
"C-calm down, Mari. You were always so skinny anyway, it actually suits you bet—"
"Hey!!!"
A pillow hit me square in the face, and I toppled over. Oof, that one stung.
"No choice. Gotta diet."
"Diet? I think you're pretty even now..."
"Th-thanks for saying that, but..."
Mari rubbed her lower belly lightly.
"I've put on a little..."
"No, really. You never had flab before. Thighs or arms, maybe."
"Yeah, 'cause I worked hard at it."
"And whatever you ate mostly went to your tits."
"...Right?"
"Exactly. Fat on your belly means your tits got bigger too, yeah?"
"...Huh? Wh-what?"
Mari jolted, then grabbed her breasts like oh shit. Even through her clothes, the full, solid mounds shifted with her grip.
"Did they really get bigger? Any more and it'll be trouble..."
"Bra not fitting?"
"N-not that bad... hold on."
She dashed off, clothes rustling as she stripped, then returned in just her bra.
"See? Still fits?"
Her breasts bulged over the bra a bit, but...
"Looks fine. If it gets too tight, you can borrow mine."
"Sports bra? Might not even fit."
"It's a looser size anyway?"
"Hmm, got it. Still, gotta exercise a bit."
With that, Mari took off the bra again.
"Gonna shower. Wait."
"Huh?"
The bathroom door clicked shut.
"Shower? Mari! What're you—"
Period over and she wants to top? I couldn't handle that yet. I'd jerked her off a few times the past couple days 'cause I couldn't ignore it completely, but she'd be backed up. Unleashed today, she'd pin me and I'd be bedridden tomorrow for sure. Aching back, groaning—the works.
"Not now, gotta get dressed and—"
Viiiing—my phone buzzed.
"What? Oh, group chat."
From Yu-hyun.
"What's she want this early? Shouldn't she be at the gym?"
I zipped up, unlocked, and—bam—a shocking photo grabbed my eyes.
"Wh-what the hell...!"
"What, what's up?"
Mari, freshly showered, shook out her hair and stood behind me. She wrapped her arms tight around me, trapping me, chin on my shoulder. This way, I'd get railed like a dog for sure—but that wasn't the priority now.
"Mari, look at this!"
"Yu-hyun? Why, wanna meet up tod—"
Mari blinked, then snatched my phone. In the group chat: Yu-hyun's photo. She'd grown a dick, just like Mari.
