Chapter Index

    “Jihoon… I can’t take it anymore. Hurry and ram me with your cock, baby♡”

    That was the whispered message I received as she suddenly pulled me close, her breath hot in my ear.

    There’s no way she could have changed so much in just a few seconds from the person who was just arguing with me because she didn’t want to lose. She’s clearly trying to excite me past the point of endurance.

    “Sis… ngh!”

    “Haaah… Are you just going to leave your personal slut’s pussy alone like this? I really want to be pounded like a dog, I’m going crazy.”

    She held my neck tightly to keep me from escaping, and spewed out more explicit words than ever before.

    Every time her hot breath and those filthy words were imprinted in my ear, I felt a strange sensation as if my spine was tingling.

    ‘How badly does she want to win that she’s doing this?’

    She’s saying words she would never even say out loud unless she was truly aroused, even acting with a seductive voice.

    I don’t know if it’s because of the wish riding on the bet, or the competitive spirit that she can’t be more of a pervert than me, or both, but I definitely know that my sister is serious about this bet.

    “Ugh, haaang♡ Come on, Jihoon… it’s not enough to kiss my womb with your glans. Please soothe my raging hole with your thick cock♡”

    Not only is she seducing me with a nasal voice, but she’s also lightly tickling various parts of my body with her fingertips.

    My sister could be as alluring as she wanted if she just set her mind to it.

    But even though her unusual appearance is charming, I’m not going to give in easily either.

    When we played together as kids, I often lost to my competitive sister and gave way to her, but I’m different now than I was back then.

    I’m going to show her that I’m not just a naive younger brother anymore.

    “What’s wrong, Jihoon…? Don’t just stand there, hurry-, hng?!”

    In the same position lying on top of my sister, I lowered my hips and pressed the entrance of her love cave more firmly with my glans.

    “Hey! Han Jihoon, you…! Hee, that’s cheating…!”

    “It’s losing if you wiggle your hips, and you haven’t done that yet. Besides, you’re the one who made the first move.”

    “You really…! I’m not going to stand still either! Ow!”

    “Ugh!”

    A shiver ran down my entire body.

    Because my sister’s lips had suddenly clamped down on one of my ears.

    In that state, she sucked and sucked, and then began to lick my earlobes with a long, extended tongue.

    “Haaop, slurp… haheee….”

    “Sis, what are you, ugh!”

    Was my ear such a sensitive spot?

    The moment her tongue, covered in sticky saliva, touched my ear, my whole body tingled.

    It would have been okay if she had just licked it, but she even started probing my ear canal with the tip of her tongue.

    “Heee… slurrp, haeee….”

    “Wait, stop it!”

    The thrilling sensation was unfamiliar, but it felt better than I expected, and if it continued like this, I felt like I would lose helplessly.

    I turned my head straight ahead and escaped from her snake-like tongue, and this time I pulled my sister’s face into my arms.

    “Uuhghgh! Ugh!”

    My sister, whose nose and mouth were buried in my chest, struggled to escape.

    But there was no way she could overpower me, and in the end, she was forced to passively breathe in my scent.

    “Sniff, huung… No, smelling you is cheat-, ting…”

    Reacting to my scent, I could feel my sister’s insides twitching little by little.

    Thanks to that, I also wanted to wiggle my hips and pound away, but I held onto my sanity with the thought that this was a strategy of sacrificing flesh to gain bone.

    “Ungh, huung… Sniff, haa…♡ I don’t want to, I’m not going to go. I’m never going…”

    It’s amazing that she’s enduring even this, she has an incredible competitive spirit.

    Then how about this.

    “Uboob?!”

    Lips overlapped with the other person without any warning.

    I didn’t even give her time to be flustered, and I rolled my tongue more busily than my sister’s tongue that had just licked my ear.

    “Unghaop, slurrp… hoop, kissing is not, haop….”

    I stubbornly stole her lips as she tried to escape, and mixed my saliva with hers.

    “Haa, slurp, churop… chuop, ugh, hua. Stop, really no, slurrp…♡”

    Her reaction was clearly different, as expected of someone who said she liked the way my scent felt closer when we kissed.

    My cock became more sensitive as the tightness inside her cunt increased, but this much self-sacrifice was unavoidable if I wanted to win against my sister.

    While continuing the coercive kiss, I also gently rotated my hips to massage her cervix.

    “Hoop, ugh… Haaagh!”

    In the end, my sister couldn’t stand it and arched her head back, coming.

    ‘Ha, damn it. She’s so tight.’

    Every time my sister shook her hips, the folds of her pussy repeatedly grabbed and released my cock.

    When she had finally calmed down, I heard a voice full of dissatisfaction in my ear, where her saliva had not yet dried.

    “Haa, haa. Where did you get off suddenly kissing me like that…”

    “It’s okay for you to lick my ears? Anyway, you just came once.”

    Suppressing the urge to thrust, my victory would come if I could just make her come two more times.

    “…No more kissing. If you do it again, I’ll bite your tongue off. I’m warning you.”

    I doubt she would really bite me, but there’s no need to do anything dangerous.

    I nodded to show that I understood, and quickly started the second round.

    “Huu, huu….”

    My sister was calming down the sensation of my glans touching her perineum with a deep breath.

    We agreed not to kiss, and considering what had just happened, it seemed like the situation was such that she would grit her teeth and endure just smelling me.

    As I was thinking of other measures, a decent idea came to my mind.

    “Sis. Aren’t you thirsty?”

    “…I am a little. Why?”

    “Let’s go get some water.”

    I got an okay and slowly pulled my hips back.

    Tssseooorreuk.

    “Haaht. Pull it out slowly… I feel like I’m going to come.”

    I had no choice but to pull it out slowly because I also felt the folds of her pussy catching on my glans as it came out.

    Just having it inside meant that there was no chance of cumming, but the problem was that if I let go of my reason even for a moment, my hips would move right away.

    The two of us, separated after a long time, got off the bed to go to the kitchen, and I took advantage of the gap in my sister’s guard and thrust my cock in from behind.

    “Ngeureup!”

    Yiseo sister, startled, covered her mouth on her own.

    She was so flustered by the cock that suddenly reached her cervix that she was even standing on tiptoes.

    But unfortunately for me, she seemed to have barely endured her orgasm.

    “Heok…! Heok, hey. What are you doing…!”

    “We’re in the middle of a bet, so we have to go get water like this.”

    “Ha, you’re such a pervert….”

    “Go forward. I’ll match your pace.”

    Holding her hips as she moved her feet with difficulty, I followed her step by step.

    Then, my sister, who had suddenly stopped, said without being able to look back.

    “Ungh, hey. I can’t do it, pull it out. Every time I walk, the inside gets poked.”

    This was exactly what I intended.

    By acting with my cock inserted all the way, the perineum would be stimulated on its own even if I didn’t do anything, and I didn’t have to play any tricks.

    “You said you could put up with something like a good feeling, right? Or are you going to give up?”

    “…Just you wait. I’m seriously not going to let this go.”

    That was the end of her murderous warning for a moment.

    As soon as she started walking forward again, a seductive moan came out.

    “Huuung… Ugh, hnght! Seriously, it’s not like a small cock, so why is it so big….”

    That’s what I want to say instead.

    Why is your pussy so tight and your ass so big?

    It’s nice that my perineum is being stimulated every time I walk, but I’m going crazy because my hole keeps sucking on my cock as if a button is being pressed.

    Her butt, which swelled out, pushed against my lower abdomen, was also one of the factors that made me feel it.

    “Heut, haa….”

    My sister, who was walking hard in an awkward posture with her lower body sticking out to me, finally arrived in front of the refrigerator.

    She took the bottle of mineral water she had taken out and brought it straight to her mouth as if she had no time to pour it into a cup.

    After quenching her thirst, she handed me the bottle.

    “…Here.”

    “Can’t you pass it to me with your mouth?”

    “Do you seriously want to die?”

    “Okay, okay.”

    Once I quenched my thirst with the bottle of mineral water I had received, it was over in front of the refrigerator.

    I started to move back to the bed in the same state as I was merged with my sister, but….

    ‘What is this. She’s surprisingly holding up well.’

    I can tell that she’s feeling it from the way the inside of her twitches every time she walks, but the news of her second climax doesn’t come easily.

    She must be holding back to win the bet at all costs.

    I’m barely holding back too, but I need to make my sister cum as soon as possible because I don’t know when my patience will run out.

    So I decided to launch a new attack while we were both standing up.

    “Hieeuk! Hey, what are you doing!”

    I strode forward, pushing against her crotch.

    Naturally, the stimulation to the perineum became stronger, and my sister, who was walking slowly while enduring the pleasure, was pushed by me and pushed forward.

    “Stop, stop! Hnght, stop it already…!”

    I didn’t even pretend to listen and continued to rush forward.

    The place where I drove my sister was not the bed, but the wall, and her body, with nowhere to escape, was stuck to the wall.

    “Hey, Han Jihoon! Don’t do it, haeuuk! Can’t you hear me?!”

    I lightly ignored her urgent cries and pressed my whole body against my sister.

    Not only her breasts, but even her navel was pressed against the wall, and she was completely stuck between me and the wall.

    “Just a little bit, hieeuk! D, don’t push me…!”

    “This much isn’t wiggling your hips, so it’s okay, right?”

    “No, if you press like that… Ahk!”

    The more her ass was pressed against my crotch and flattened, the stronger the force with which my glans pushed up against her cervix.

    She tried to escape by even standing on tiptoes, but she couldn’t overcome the difference between my cock length and our height.

    “Haaheuk, keuk! Cheating! Poking my womb like that is cheating…!”

    The only thing she could do, pinned down by me with both hands on the wall, was to protest with resentment.

    The sight of her being helpless with her deepest and most sensitive parts held hostage was enough to arouse a man’s sense of conquest.

    “Haaheuek! Keuek! I can’t move because I’m afraid I’m going to come…!”

    She’s doing a good job of holding on even though her cervix is being completely crushed.

    With the thought that I was going to make her cum this time, I also stood on tiptoes and pushed my cock in deeper.

    “Heeheek! No! You can’t come in any deeper now, no no no-, nnghaaahk!”

    My sister, unable to withstand the onrushing pleasure, came with a vulgar moan.

    “Aeu! Ahk! Sto, stop… poking my womb, sto, stop… Heegeuek!”

    Tssiiiiik! Tssiik!

    Was it because the recoil when she came was so great because she had been holding it in with all her might?

    She was spraying the wall with a vaginal squirt and shaking her whole body.

    While my sister was immersed in the afterglow of her orgasm, her pussy was clenching madly, and I almost wiggled my hips and pounded away.

    “Heok. Heok… I told you not to… You made me cum, you bad bastard, seriously!”

    “I’m sorry. I was at my limit too, so I was a little rushed. But you still have one chance left, right?”

    As I appeased her in a way that suggested that she was now at an advantage, the sharp glare she was sending me as she looked back softened a little.

    “Don’t do anything at all now. If you do it again….”

    The way she trailed off with a murderous atmosphere was no joke.

    “Okay, I won’t. I swear, really!”

    I had calmed down my sister’s anger and had even come to a situation where I would win if I made her come just once, but I was slowly running out of room.

    To make matters worse, we had agreed not to do anything anymore, so I was feeling frustrated when the phone rang near the bed.

    ♩~♬~♪♬.

    “Oh? Sis, you’re getting a call.”

    “Who is it? Hnght, haa… ugh.”

    With her lower body connected to mine, she hobbled towards the bed, and carefully moved her feet so that my cock wouldn’t fall out, and finally picked up her phone.

    “…It’s Mom?”

    “Really? I’m okay, so take it.”

    “I’m not okay? Hnght… Just call her later.”

    I waited silently for the ringtone to stop, and the room became quiet again.

    ‘Too bad. It would have been nice if she had answered.’

    Since I wouldn’t be able to act freely while talking on the phone, the initiative would naturally have passed to me if she had answered the phone.

    But the phone had already been hung up, and just as I was about to give up, lamenting that the opportunity had already flown away.

    ♩~♬~♪♬.

    “It’s coming again? Could something urgent have happened?”

    “Ha, damn it. What’s going on…? Get away from me for a second.”

    “Hey, no way. We’re in the middle of a bet.”

    I shook my head and refused.

    There was no way I could just throw away the golden opportunity that Auntie had given me.

    “Are you crazy? How can I answer like this!”

    “What about it. You said you could put up with this much.”

    “Ahk, hnght! Get off me already!”

    While she was arguing, the ringtone was ringing noisily.

    Eventually, my sister picked up her phone and brought it to her ear.

    “Oh, Mom. Why…?”

    -Yiseo.

    As soon as I heard Auntie’s voice, her pussy tightened and she reacted.

    The tension that she couldn’t get caught must have made her already sensitive perineum even more sensitive.

    Not wanting to miss this opportunity, I quietly took my hand towards my sister’s lower abdomen.

    The part that was bulging out because she was forcibly accepting a thick cock, felt with the fingertips that caressed her soft skin.

    I positioned my finger on the top of it, where I thought I could stimulate her perineum.

    -Are you home right now?

    My sister’s argument was that she could endure pleasure with reason, so she was more normal than me.

    I pressed down on her lower abdomen to see if that was true.

    “Hieeuk!”

    A shrill sound burst from her mouth, sensing the danger.

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