"Then I'm going to shower. You better have finished by the time I'm back."
"Finished…?"
I wasn't naïve enough to not know what she meant.
Noona stood up and, in one smooth motion, pulled off the bra she was wearing.
She wasn't wearing anything underneath. No surprise nipple covers, nothing.
Serena's bare breasts jiggled as they came into view.
I stared, mouth agape, as her top lifted and her breasts bounced before settling under gravity.
Her skin was creamy and smooth, practically glowing, and her nipples stood firm, a dusky pink that begged for attention.
Perfect in size, shape, and color, the kind of breasts every man dreamed of.
I knew I shouldn't look, but my gaze was helpless, drawn in like gravity had turned her into a star and me into a meteor.
"I'll lend you this, so use it."
Noona casually tossed the bra onto my head.
Lend it? Use it? For what?
As I stood there gaping, she added:
"Cum on it. Don't spill anywhere else."
On this.
What? My cum?
She wanted me to ejaculate onto it?
Onto her clothes?
"I'm going to shower now."
And just like that, Noona left the room like a passing breeze.
I stood there, holding her bra, completely dumbfounded.
Was I really about to masturbate with this? Using the clothes she'd just worn?
If anyone found out, I might get kicked out of the house.
But Noona had allowed it. No, she'd ordered it.
So I had no choice but to obey.
I didn't think she was doing this just to mess with me.
She'd let me touch her chest, stripped in front of me, and even showed me her bare breasts.
This wasn't something done as a joke.
And now she was telling me to masturbate with her clothes?
Noona had always been obsessive about cleanliness.
She might say she could just throw away dirty clothes, but the mere thought of something like this would normally disgust her enough to faint.
Yet she'd allowed it.
That meant she was taking this seriously.
"Was I that obvious…?"
I'd thought I was hiding my feelings well.
I believed that if I kept my filthy desires, toward my mom, my sister, my younger sibling, locked deep inside, no one would get hurt.
But apparently, Noona had seen right through me.
"Haah…"
Self-loathing washed over me.
I didn't think I could face her after this.
And the most shameful part? Even in this situation, my cock was hard, throbbing with excitement.
It was practically staging a protest, demanding relief.
I retreated to my room.
To complete Noona's assignment. To calm my rebellious erection.
"Huu…"
I locked the door and lay on the bed, stripping off my pants.
My cock stood straight up, pointing at the ceiling.
I unfolded Noona's bra in my hands.
This was what she'd been wearing just moments ago, still carrying her sweat and scent.
I didn't know what material it was, but it was soft and stretchy.
When I brought it to my nose, I caught the faint smell of fabric softener mixed with sweat.
That scent, like pheromones, only turned me on more.
Using Noona's permission as my absolution, I wrapped the bra around my cock and started stroking.
When I closed my eyes, I could still see her breasts as she undressed.
The softness under my fingertips lingered in my memory.
I even regretted pulling my hand away so quickly.
"Noona…"
Beautiful, strong, admirable Serena Noona.
Masturbating while thinking of her felt better than ever.
+++
"Haah..."
There was always a guest that visited me after I finished masturbating.
The post-nut clarity.
Today's clarity was unusually long and heavy.
Of course it was, after what had happened.
What kind of face was I supposed to show my sister now?
Could I really act like nothing happened around Mom or Mia?
Wouldn't the world be better off if someone like me just dropped dead?
Honestly, every possible thought ran through my head.
"Woojin. Open the door."
"Ah, uh... just a second."
My sister had already finished her shower and was knocking on my door.
I hurriedly pulled on my pants and opened the door, and she strode in as if it were her own room.
"Mmm~ The smell of night blossoms. You really went at it, huh?"
"...Please don't. I was wrong."
I wanted to die of shame at her words.
Was there anything more humiliating in this world than getting caught masturbating by your own family?
My sister ignored my words completely, glancing around the room before picking up the crumpled bra I'd tossed into the corner of the bed.
"You came on this, right?"
"...Yes. I did."
I couldn't lift my head.
"Good job. From now on, before you masturbate, you'll tell me you're about to. And after you're done, you'll report that you did. No skipping."
"What? Every day?!"
"Why? Don't like it? Should I tell Mom instead?"
She waved the bra in her hand.
It was soaked with my cum.
If Mom ever saw that, I'd have no choice but to jump off a building.
"Noona! You're the one who told me to do it!"
"Hehe. You really think Mom would believe that?"
"That's..."
Right now, my sister looked just like the villainous mother from some drama.
Now that I thought about it, the whole thing was ridiculous.
Even if I told Mom the truth, there was no way she'd believe me.
"...I didn't know you were like this, Noona."
"Woojin. Don't take it so seriously. Just do as I say, and I won't tell anyone. Got it?"
She pulled me into a hug, patting my head like she was soothing a sulking child.
To me, this was a life-or-death matter, but to her, was it just some meaningless prank?
And the saddest truth was, even now, my heart was pounding as my head pressed against her plump chest.
Even in a situation like this... Pathetic.
"...Fine. I'll report to you… every day."
"Good choice. Then sleep well. See you before you jerk off tomorrow."
Humming cheerfully, my sister walked out of my room.
Still holding the bra I'd just came on, soaked in my cum.
I stared at her retreating figure before lowering my head.