Chapter 69. Birthday Gift
I sat on the sofa with her birthday present right there, starting to peel off my little sister's T-shirt, but then I changed my mind.
She looked so damn happy today. She'll probably put up with me being a bit of a jerk. Opportunities like this don't come around often, right? ...Time to make her do all sorts of things. Total trash move.
"Take your clothes off first."
"...Huh?"
"Huh?"
"...Yes."
She seemed flustered, slipping into casual speech for a second, but when I gave her a slight glare, she obediently switched back to formal. Then, after a brief hesitation, she stripped without protest.
Pulling down her dolphin pants exposed her thighs even more—they'd been practically on display already. That lewd pelvis of hers, still covered by just her panties. I devoured her lower half with my eyes, and then she started on her top.
As the T-shirt lifted, her navel came into view, slowly revealing up to her collarbone. Beautiful breasts, not even covered by a bra. Was it because of the necklace I'd given her? My possessiveness surged even stronger.
She crossed her arms to hide her chest like she was embarrassed, even after all this, so I forced them away. Her face flushed red as she turned her head. But after that, even when I let go, she didn't cover up again.
...It thrilled me, feeling like I'd corrupted this once-pure girl on my terms.
"Um, Oppa... Are you going to do it again...?"
"...Calling me Oppa feels weird with that formal tone. Call me something else."
"...Pardon?"
Truth be told, I love it when Gyeo-ul calls me Oppa. But hearing it with that polite formality... it doesn't feel like she's my little sister anymore.
...Not that I'd say it now, but she turns me on more when she emphasizes that she's my real little sister. I didn't have this fetish before, but it cropped up after her confession that day. No one's to blame but me.
...So it's fine to corrupt her however I want. It's my fault, after all.
"Then what should I call you...?"
"...Something that fits your current speech."
"Um... Senpai?"
"I go to a different school, remember? Not senpai."
"Or... darling...?"
"...Save that for later. There's something more fitting. ...Between us."
"You really want to hear that...?"
"Just once."
"Fine... just for today... then."
Stumbling toward the answer, my sister covered her face with both hands out of embarrassment and called out to me.
...It was a response I never could've imagined.
"M-Master...?"
"...Hey."
...No, I'm not that trashy. That's not the answer.
But hearing her say it—face beet red, submitting to me—it was so hot, right or wrong, I wanted to give it a perfect score. Bonus points for not covering her breasts and nipples while hiding her face.
I wanted a clear view of that embarrassed expression, so I stepped closer and brushed her arms aside. Her pupils trembled even more than during her first confession—like she could bolt any second.
"You said you like me because I'm your real Oppa... So why 'Master'?"
"B-Because... you're such a huge perv... I figured you'd like this kind of thing... sir."
"...You don't have to call your real Oppa 'Oppa.' There's all sorts of ways, right?"
"Can't you just tell me the answer...?"
"If I do, you'll keep guessing wrong. Why should I?"
"You're such a total perv... sir..."
With her arms pinned by me, unable to escape, she rolled her eyes and head, thinking hard.
...It's so obvious. You tried it once before. Even if it was teasing.
"Wait... is it... Ah. Still, that's a bit... But... sir."
"'Master' came out— what's the holdup?"
"That's... like a concept? So it's okay... sir. But this one's a little... pride issue."
"Say it. What is it."
"You're so mean... Young master."
"...Good girl."
You'd think "darling" or "Master" would be more embarrassing and lewd, right? But if that's how you feel, then it must be. Your heart's pounding already, and I haven't even touched you yet. Means it's that shameful.
Good call ordering her to. I want to stain every corner of my little sister with my color, one by one.
"Haa... Kim Gyeo-ul. Take off your panties."
"W-Wait... You seem so turned on, young master... Let me do something else for you."
"Something else?"
"If we do something naughty now... you'll go until I'm broken... sir."
"...What're you gonna do?"
Couldn't deny it. I said until we're exhausted, but... we should tire out together. Ravaging her when she's out cold isn't my thing.
"If... young master wants something... just say it... sir."
"...Hold on."
What I want. Besides sex, there's tons I wanna try, but my absolute favorite is obvious. I even bought stuff for it.
I got up from the sofa and headed to my room drawer. Grabbed something ordinary-looking—no hint of lewdness—and handed it to her as I returned.
"...What's this? Some kind of lotion... sir?"
"Gel."
"Gel?"
"Gel for naughty stuff."
"..."
"...Use your tits. That okay?"
"...Yes."
I handed her the lube gel and stripped off my own clothes. The only scrap of fabric between us was her panties. If someone showed up now in this unlocked living room, we'd be done for. Maybe that's why I'm this excited.
Because it's something we shouldn't do.
"Sh-Should I put it on... your dick... or my breasts...?"
"...Breasts. My dick's already sticky."
"Got it... sir. Ugh, it's cold..."
I laid her back on the sofa and climbed on top. First, I took off the necklace—it'd just get in the way. She spread the lube in her cleavage, making it all slick and sloppy, then cupped her hands at her navel, presenting her breasts perfectly for me.
"Please... use my breasts... young master."
"...Why're you so good at dirty talk, Kim Gyeo-ul."
"It's... your fault, young master... You taught me everything."
"Fuck... seriously. Haa..."
She'd gotten used to the formal speech by now. Still embarrassed, but starting to provoke me like usual.
Same actions, but that one shift in tone made it feel one degree hotter, fresher. I grabbed her tits like I wanted and fucked them.
The gel was cold, sure, but slippery enough—no issues thrusting between them. The sensation wasn't intense. Just flesh, after all.
But watching my dick bury completely in her breasts, only the tip popping out near her chin with each thrust? Perfect feast for my lust.
"Feels good... sir?"
"Fucking amazing..."
"...Better than... kissing me?"
"...About the same."
"Then... compared to... sex...?"
"Sex is better."
"You like sex... more than kissing... young master?"
"...Kissing during sex."
"Such a total perv... sir."
"You like it too."
"Only 'cause it's... with you... young master."
No bra or anything getting in the way like last time, so the stimulation was tame. But visually? Those sticky, glistening tits. Lewder squelching sounds than during sex filled the living room.
Above all, her awkward but obedient following of my words stirred a primal conquest lust from my dick, wrapping my whole body lightly.
To fully satisfy that instinct, still a bit short, I made a naughtier request.
"...Wanna lick it?"
"...Pardon?"
"Lick the tip. You said you'd use your mouth last time."
"That was... as a substitute when we couldn't... sir."
"I was gonna fuck you, but you offered something else, so I held back. ...Not biting yet—just lick."
"Just... licking...?"
"Yeah."
I'd planned to take her mouth slow anyway. So start with licking. Nice and slow. Step by step.
I shoved my dick as deep as possible between her tits for easy glans access. She lifted her chin, stared at the tip, then tentatively stuck out her tongue.
Like a cat dipping a paw in water and pulling back, her tongue tip brushed the glans and retreated. Then it peeked out again, lapping delicately like a cat drinking—carefully licking the dick fucking her own tits.
I stopped thrusting for paizuri, so less stimulation than before. But my lust? Overflowing beyond words.
"Hah... Um, there... don't cum... sir?"
"Why?"
She lapped at my lube-and-precum-slick tip, then made a request. So very her.
"If... my mouth gets... dirty... I can't kiss you... later... sir."
"...Fuck, Kim Gyeo-ul!"
...Can't hold back.
I don't know why kissing her feels that good, but when she begs like this, how can I refuse? She offers her lewd body entirely to her real Oppa—me—letting me toy with her to my tastes from start to finish. If the price is a kiss, I'll give a million, ten million.
I pulled my hands from her breasts I'd been savoring. Grabbed her nape where she lay sideways on the sofa and sat her up. Leaned her head back against the armrest and stood on my knees.
Even now, she clutched her tits, anxiously keeping my dick enveloped like it might slip out.
"...Cover your mouth and no cum on it—do whatever, right?"
"Young master... wants to kiss too...?"
"Yeah. ...With you."
She met my eyes, then softly closed hers. Still soothing my dick with her breasts, entrusting everything to me.
"It's yours anyway... Oppa. ...As you wish."
This time, calling me Oppa with cheeks and ears flushing again, I captured her. Deep, intense kiss. Repaying her clumsy efforts to sate my lust—filling her mouth with my saliva, her breasts with my cum. Just as we wanted.
I defiled my little sister to my heart's content.
Now, even if we're caught... I don't care. This happiness is beyond my wildest dreams.
