Lightly Bound: Decisive Battle Sunday
Really, you have to tie me only lightly. Finally, the Sunday of the decisive battle dawned.
Using the excuse of learning safe tool usage, I knocked on Seo Ye-eun's front door once again. My heart was pounding, but I took a deep breath and tried to calm myself. Yeah, this was just to learn the proper way to use them so I wouldn't hurt my body. It absolutely wasn't because I was some cheap slut who enjoyed being dominated and had come here of my own accord.
Click.
"Oh my, our Seo-jin's here? Right on time."
"Ah?!"
"Come on in~."
The front door opened then, and Seo Ye-eun greeted me with a radiant smile. The moment I saw her face, my heart, which I'd barely settled, started thumping wildly again.
Under her guidance, I cautiously entered the living room, where Kang Hye-won was lounging on the sofa, scrolling through her phone just like last time.

She glanced over, pulling her eyes from the screen to look at me.
"What, the bitch in heat showed up to learn again."
"What...?"
"When are you gonna figure it out on your own? You gonna keep clinging to your owner's pant leg and squirting every time?"
"Th-that's not it! I just came to learn how to use them safely!"
"Sure you did. Whatever you say~."
I yelled back indignantly, but Hye-won just snorted in mockery. I should have been pissed, but her taunting fact-bomb left me biting my lip in silence. It was undeniable—I couldn't even masturbate properly alone, so I'd crawled here begging for help.
"Hye-won, don't be so harsh. Seo-jin just doesn't want to get hurt, right? Isn't that it?"
"Y-yeah... That's right."
"Okay, before we dive into the real lesson, how about we head to the bathroom for a quick rinse first?"
Seo Ye-eun wrapped an arm around my shoulders and gently nudged me toward the bathroom. I obediently went in, stripped off all my clothes into the laundry basket, and turned on the warm water.
As the shower sprayed down, I glanced lower. My pussy was slightly swollen and red. Traces of my failed solo attempts up until yesterday.
"Damn... Why can't I cum on my own...?"
I sighed, lathered up the shower puff with soap, and scrubbed my swollen pussy hard. Ignoring the anxiety and strange anticipation creeping up to tickle my gut, I quickly washed and stepped out.
She'd probably tell me to strip anyway. After a moment's hesitation, I decided to head to Seo Ye-eun naked.
"All clean? Come here, Seo-jin."
"Yeah..."
I tossed the towel into the laundry basket and looked up. Seo Ye-eun, perched on the bed, called me over. I slowly raised my head to her—and froze in place.
Somehow prepared in advance, an array of adult toys was laid out beside her. All kinds of vibrators and dildos, electric massagers, anal beads, even what looked like a suction device. Tools I'd heard about at the adult shop when asking for masturbation recommendations.
"Y-Ye-eun...? These are..."
"Oh, you saw them last time too. Don't you remember?"
"W-well, but these are different from then..."
"Of course there are tons more~. Last time I only pulled out the basics."
How was having this many normal?! Stunned, I scanned the tools. Several seemed meant for the pussy, and others for... elsewhere. Were we using all of these? Instinctual fear mixed with bizarre excitement, making my body tremble.
Noticing, Seo Ye-eun smiled softly.
"Don't worry~. We won't use everything—just what you can handle."
"Ugh..."
"So, wanna climb up on the bed?"
She patted the spot beside her with a gentle smile, and I slowly climbed up and sat. Fine, running away now was pointless. This was my chance to prove to Seo Ye-eun and Kang Hye-won that I wasn't some pervert bitch who got off on being dominated and toyed with.
"Let's set a safe word first. What'll it be?"
"Um... Retaker's Academy."
"Retaker's Academy? Good. Now, for safety, let's put on the safety straps."
"Safety... what?"
Looking at her hand, she held black leather straps. Four pairs, each ending in wrist guards. Like they were meant to bind my limbs and fix them somewhere.
"Hands out first."
"Wh-why my hands...?"
"Safety straps, remember~? We'll tie your limbs lightly to the bed."
"T-tie what where?!"
I yanked back in panic. I'd come to try tools today—not get bound! Being tied to a bed was just fantasy fodder; I had zero intention of actually experiencing it.
I shook my head vehemently in refusal, but Seo Ye-eun explained patiently, unfazed.
"Seo-jin, calm down. This is all for your safety."
"For my... safety?"
"Yeah. Beginners instinctively buck or twist from new sensations. One wrong poke or bend inside, and you could get seriously hurt."
"Oh..."
"So we lightly fix your hands and feet to keep your body from jolting. Not to torment you."
It... made sense. Though given what she'd done before, I couldn't buy it was 100% pure. But no counterargument came to mind. As I hemmed and hawed, Kang Hye-won, leaning against the door with arms crossed, scoffed coldly.
"Hey, Lee Seo-jin. Scared of a little tying up? What a chicken."
"What? I'm not scared...! It's just..."
"Bullshit. Ugh, then just get dressed and go home. Don't waste our time coming here."
"Sh-shut up...!"
Her taunt hit a nerve, and anger flared. Backing down now would make me a total coward. I'd come begging to a friend's house because I couldn't even jerk off alone—if I chickened out here, I'd be a spineless loser. My pride wouldn't allow that.
But getting tied up still scared me a bit. Then Seo Ye-eun whispered with a smile.
"If you're really scared, we have a safe word, right?"
"Ah, y-yeah..."
"Just say it, and we stop. What's to worry about?"
Right. Like she said, I had a safe word. Even bound head to toe, I could stop her anytime. Last time I lacked the guts to use it and went all the way, but not today. I wasn't a pet—I was just learning tool use from a friend.
In the end, I nodded and extended my arms again.
"O-okay... But only lightly. Promise."
"Of course~. Now, lie down on the bed like this?"
She fastened the leather around my wrists and tightened. Blood flowed, but no escaping. Following her lead, I lay on my back. She pulled the straps, raising my arms above my head, securing them firmly to the bed's headboard pillar. Then she bound each ankle to the footboard pillars with more straps.
"Hng..."
"Comfortable? Not too tight?"
"Yeah..."
"Tell me if it is—you might have to stay like this a bit."
I nodded slowly. Arms raised like a V over my head, legs spread in an M—perfectly defenseless. Couldn't lower my arms or close my legs to hide my shame. Cool air brushed my exposed privates, goosebumps rising from humiliation and fear.
"All secured perfectly... Ready for the first lesson?"
"Y-yeah..."
"Can't start too intense, so we'll ease in with this."
Smiling, she picked something up and showed it. The exact pink egg-shaped vibrator I'd bought at the shop.
That one...!
If it was just similar in color and shape, I'd dismiss it as coincidence. But the brand, button placement, subtle rounded curves—eerily identical to the one I'd bought yesterday.
I'd vaguely said "something small" in the message...
How did she prepare the exact same one? Too perfect for chance. Did she spy on me entering, paying, or ask the clerk? If so...)
"What's wrong, Seo-jin? Bad face."
"N-no... Just..."
"Cuz it's the same as yours?"
"Huh...? H-how..."
"I said I'm a regular there~. Sis always recommends this for newbies."
"Oh... R-right."
She continued casually, and I nodded, pushing suspicions aside.
Yeah, regulars know. Don't overthink. Actually, good she has the same one.
It's something I've definitely used.
It's fine, Lee Seo-jin. You've tried it already.
Yesterday and before, I'd tested its vibration levels endlessly—how it felt on me, my limits. Conclusion: this toy alone couldn't push me over solo.
I'd only climaxed after overlaying horrific fantasies of being bound and violated by her.
So even if it touched me now, no unexpected rush would break me. No weird fantasies, grip reason tight—no pathetic cumming like yesterday.
That's what I'd thought.
"Ready? Turning it on. Relax."
"Y-yeah..."
"You can handle this level easy, right?"
"Yeah... No pro—"
Vrrrrm...!
"Hnnngh?!"
Until that little egg rotor touched my pussy, delivering stimulation beyond imagination.