A Secret
"You're doing great. Just relax."
After finishing that sandwich hug with both noonas, we finally started the workout. They had me loosen up with some stretches first, and now I was on the mat, lengthening out my muscles. They said we'd be doing this before every session from now on — apparently it was excellent for keeping you from getting hurt.
There were two problems, though.
One: my flexibility was so awful we had to start by building it from scratch.
And the other...
Are they doing this on purpose?
The assisting movements they used to improve that flexibility were incredibly lewd. To be precise, the movements themselves weren't lewd. The noonas helping me were.
"Ah — that hurts...!"
"It's okay. It has to hurt if you want it to improve. Just tell me if it gets too much to handle."
Right now Seoyeon had her foot pressed against my ankle to pin it in place, pulling my hands to split my legs apart. I was so stiff I couldn't bend forward at all, so she ended up leaning her own upper body down instead. As she folded forward, her loose tank top sagged open, and the small breasts inside came into full view. She wasn't wearing anything underneath, so her nipples jutted out plainly.
They're pretty big compared to her chest.
Just the right size to play with, too. And for the record — I was not slacking off. I was giving it my all. It just so happened that her chest was sitting right where my eyes landed.
"Come on, just a little further — stretch!"
I'd been frozen in place for over a minute, so Seoha started pushing my back from behind. Did she really have to do it by dumping her breasts onto me?
"U-um! Coach Seoha? Your chest is touching my back."
"Huh? Oh — sorry!"
She jumped back, startled. Playful as she was, I figured she at least took workouts seriously. That thought lasted all of a second.
"This is better, right?"
She said it while burying her breasts against the back of my head. The soft press of them against my neck and skull finally broke whatever resistance I had left. I started getting hard.
Don't get up. Don't you dare get up.
I wanted to adjust my pants so it wouldn't show, but Seoyeon still had my hands.
Un-until the East Sea's waters...
I had no choice but to start reciting the national anthem in my head — and that's when I felt a hand on my thigh.
"Nngh!? S-Seoha noona!?"
"It's Coach Seoha, remember? We're in the middle of a workout."
She grinned as she stroked the inside of my thigh. Judging by that smile and what she was doing, she definitely knew I was hard. I lifted my head slightly to glance at Seoyeon. Her gaze was locked on a single point.
Seoyeon too?
She always carried herself so calmly I'd assumed she wasn't interested. Apparently not. Her face flushed, she was staring at the outline of my cock through my pants, her breathing a little ragged. Whether she was turned on by me or just by my cock, I couldn't tell.
"Ahem! S-Seoha? That's sexual harassment too. Stop it."
Seoyeon squeezed her eyes shut, then finally managed to turn her head and scold her sister.
"Why? Dan-woo already said it was okay! And you're interested too, unnie. Don't act all proper just because he's watching."
She answered Seoyeon's rebuke by moving her hand even more boldly. Seoyeon opened and closed her mouth, at a complete loss for words, then let go of my hands and stood up. Caught off guard, Seoha pulled her breasts away from the back of my head.
"U-unnie?"
"Did you hear that?"
Seoyeon spoke with her head lowered. That question was aimed at me.
"H-hear what?"
"What Seoha just said. Did you hear it?"
It would've been weirder if I hadn't. She'd said it right behind me. But when I saw her face slowly lifting toward me, the words died in my throat. She was smiling, but there wasn't a trace of warmth in it. Just a cold, empty smile.
"W-what did she say? I was so focused on the stretch I didn't hear a thing..."
"...Hah. Is that so? If you didn't hear it, that's fine."
Seoyeon let out a sigh and shifted her gaze from me to Seoha.
"Seoha. A word."
"Eek!? U-unnie! I was wrong! I'm sorry, I'm sorry!"
Seoha was dragged out by the scruff of her neck. Her sagging tank top pulled back as she went, and one breast popped out through the wide-open side. I'd already been able to see almost everything, but seeing it raw like this was a different story. Compared to the size of her breasts, her areolae and nipples weren't that big.
"Whoa..."
It was only the second time I'd seen them, but the size really did take my breath away.
"Looks like they're done talking. Working hard?"
"Yeah. Don't worry about me, noona — go do your own workout!"
The two of them had barely left when Se-ah came in. We chatted while I waited for them to come back, laughing about nothing in particular, and before I knew it they had returned. Se-ah noticed them first, gave my head a pat, and left the room. The two of them came in as she went out, but they looked completely different from before.
"Uh... why the change of clothes...?"
Instead of the eye-pleasing loose tank top, Seoha was now wearing a long-sleeved athletic top that clung to her body but showed almost no skin. She'd put on nipple patches too — the outline of her nipples was barely there. Even so, her breasts were so big and the fabric so tight that the tips still swelled out a little.
"Don't worry about the clothes. I'm just trying to keep my little sister from becoming a criminal."
"D-Dan-woo... eek!?"
Seoha started to come in for a hug, but Seoyeon shot her a look. Before they'd left, she would've wrapped herself around me without a second thought. Now she flinched and stopped in her tracks.
What the hell did she do to her?
They say the quiet ones are the scariest when they get angry. Turns out that's true.
"Shall we pick up where we left off?"
Seoyeon sat down on the mat and looked at me. I nodded and sat across from her. After that, things were relatively normal. Well — Seoyeon's chest kept peeking through her tank top, which was pretty lewd on its own — but otherwise it was a perfectly wholesome session.
"I'm gonna go grab a gym ball real quick."
"Go ahead."
During a short break, Seoha left the room to get an exercise ball. That left just me and Seoyeon. I glanced at her — her face was flushed, probably from the effort of teaching me. The flexibility work hadn't even been that intense, but her breathing sounded a little labored.
"Hah... hah... nngh!"
Teaching really is harder than learning.
I was feeling a genuine flicker of respect when Seoha came back.
"Looks like we've rested enough. Shall we get started? Once this is done, we'll finish with more stretching, and that's it for today. Hang in there!"
"Yes!"
Seoha set the gym ball on the floor and demonstrated first. When it came to stretching and flexibility, she had Seoyeon beat.
"You keep your legs planted on the ground and rest just part of your back on the ball! It's called a bridge — you use your leg strength to keep your balance!"
With her back on the ball, she walked me through the purpose of the pose and what to watch out for. When she finished the demonstration, she handed it over.
"L-like this?"
I lay back against the gym ball the way she'd shown me, but something felt off. Maybe it was just me, but more of my back seemed to be touching the ball than when she'd demonstrated, and my head felt tilted further back, too.
"That's fine. It might actually be better to start that way. The more surface area you have, the less strain there is, and the easier it is to hold the correct form."
It was Seoyeon who answered, not Seoha — but since Seoha didn't correct her, it must have been fine. I focused on keeping the ball from rolling, and my lower body tensed up. Holding the position worked my thighs, of course, but the arch in my back hit my ass too.
"Uh, how long do I hold this?"
I'd missed the most important part, so I asked. No answer came.
"Seoha noona?"
"H-huh? What?"
She sounded startled, like I'd caught her off guard. I asked again.
"Three minutes. You've done thirty seconds, so two and a half left."
Once again, it was Seoyeon who answered. The faint hint of heat in her voice was probably just my imagination.
Hold this for three whole minutes?
Wasn't that a bit much for me? My legs were already starting to shake. I was about to ask them to cut it short when I felt something I absolutely shouldn't have been feeling at my crotch.
"Hngh!? W-what are you doing?"
"Don't break form!"
I lifted my head, thinking Seoha was messing around again — but she pressed down on my forehead and forced me back into position. Then she stepped in close and lifted my shoulders to make the hold a little easier. With my head tilted back, her crotch ended up right in front of my nose.
"W-wait! Where do you think you're sniffing!?"
I took a deep breath, and a flustered voice came from above. She'd already touched my cock, so this much should've been fair game, right? That's what I thought — but something was off. Seoha was clearly holding my shoulders to support me, and yet I could still feel a hand on my crotch.
"Who keeps... hngh!?"
"Hyaah!? D-Dan-woo!"
I was so startled I tried to sit up off the ball — and buried my face straight into Seoha's crotch. Even from a distance the scent had been filthy, but pressing my nose right against the source was on another level. A single breath and it felt like my lungs had been filled with nothing but her.
"S-stop sniffing!"
Seoha stumbled back, shouting. Clean air filled my lungs, but that filthy scent still lingered at the tip of my nose. And even while we were putting on this accidental comedy sketch, the hand on my cock never stopped. I hurriedly lifted my head to check — and it was Seoyeon. The same Seoyeon who'd just scolded Seoha for sexual harassment. Her face flushed, breathing hard, she was stroking my fully hard cock through my clothes.
"S-Seoyeon noona?"
"I'm sorry, Dan-woo."
I was so shocked I nearly fell off the ball, but Seoha caught me from behind and I managed to keep my balance. Even through all that chaos, Seoyeon never took her focus off my cock. If anything, her face was getting closer. A little more and I'd feel her breath.
"Unnie, that's enough!"
"Huh?"
Seoha's shout finally snapped Seoyeon out of it. She looked like she didn't even know what she'd been doing.
"Noona, what the hell is..."
"I'm sorry. We tried to hold back, but..."
Seoha trailed off, like she couldn't bring herself to finish. I turned my head to look for Se-ah, who'd been waiting outside — but the transparent glass wall had already gone opaque.
"If you're worried about Se-ah, don't be. She's the one who told us, actually."
"T-told you what?"
"That if you didn't mind, we should gradually raise the intensity."
...Se-ah said that?
It was probably the same reason she always told me to hold other women — but to go this far? The noona who always put me first, doing this without even asking?
"I-it wasn't supposed to go this far!"
"What?"
"Se-ah only told us to do some slightly more intense skinship."
Seoha chose her words carefully, speaking slowly.
"She said she felt like she was being too focused on herself. And since you like this kind of stuff, she thought if we did some skinship, you might start wanting it yourself."
"I see..."
Se-ah had been more genuinely worried than I'd realized. Enough to go this far. I decided I needed to say something to her today, just to put her mind at ease — and that's when Seoha said something loaded.
"Haa... this is a secret, though."
"A secret?"
"You can't tell Se-ah I said this, okay? No — just act like you never heard it."
And what she said after that preamble was something I couldn't believe.