Ambiguous Sister

Last weekend, my younger sister, a high school student, brought two classmates home to do their homework.

Since the living room was spacious, I was ushered away from watching TV.

The three vibrant girls sat huddled around the table, engrossed in their work, their occasional playful banter making me want to join them.

"Brother, move away a bit, you're in the way," my sister said, glancing at me.

"Wait, isn't your brother from National Taiwan University? Ask him about this problem," said the girl with the ponytail and glasses.

"Yeah, I've been thinking about this problem for ages, big brother, can you take a look?" the short-haired girl said.
"Uh... okay, I'll take a look." Seeing that my sister didn't object, I went over and sat down next to the short-haired girl.

"Oh, look, draw an extension line here, then use the Pythagorean theorem to integrate the cosine, and you get the expected value."

"Wow! Really? How come I didn't think of using integration before?" the girl with glasses exclaimed, leaning closer, her face full of surprise.
My younger sister, looking unconvinced, waved her hand at me and said, "Alright, alright, you can go now..."

"Wait a minute, there's this question, this question, this question..." the girl with glasses interrupted, pointing to a bunch of circled questions.

I looked at my sister a little awkwardly, seeking her opinion with my eyes.

My sister coughed, cleared her throat, and said, "Okay, then you sit over there and look." She pointed to the other side of the table.
After more than an hour of hard work explaining, the test questions were almost solved, and the girls gradually started chatting about unrelated topics.

"Big brother, what's your name?" the short-haired girl asked, starting a conversation.

"Uh, my name is Xiao Zhi, you can just call me Brother Xiao Zhi, and what about you?"

the short-haired girl grinned, "My name is Haibara, you can call me by my nickname, Milk Tea."

Milk Tea revealed two small tiger teeth, which, combined with her round face, made her very charming and cute.

I looked at the girl with the ponytail and asked, "And you, what's your name?"

The girl smiled slightly, revealing two dimples on her oval face, and said, "My name is Jingxiang, and my nickname is Pudding."
I said, "Wow, everything's related to food, do you all love to eat?"

Milk Tea said, "No, look, big brother."

Milk Tea lifted her shirt, revealing two round breasts, and then pulled one side of her bra down slightly,
revealing delicate nipples, a light brownish color.

I nodded and said, "I see. And Pudding?"

Pudding was a little shy, and pulled one of my hands under her shirt.

I immediately touched something big and soft, which must be why she got her name, and it certainly lived up to its name.
I nodded again, and politely squeezed it twice before withdrawing my hand.

"Hey, does my sister have a nickname?" I asked Milk Tea curiously.

"Don't tell! Neither of you are allowed to tell!" my sister said angrily. "We've finished our homework, let's go shopping, come on!" My sister grabbed her classmates and ran off like a whirlwind.

I was left standing there alone, shaking my head and smiling, "Youth is so wonderful..."

That night, as I was getting ready for bed, someone knocked on the door, and it was my sister who came in.

I saw that my sister was wearing a thin gauze nightgown, and it seemed that she wasn't wearing a bra underneath.

Her breasts were the right size for her age, and their lines were faintly visible.

My sister approached the bedside without saying a word, and under the light of the nightlight, the atmosphere was slightly eerie.

I asked, "Sis, what's wrong? Is something the matter?"

My sister gently untied one of the shoulder straps with her fingers, and the silk straps slid down her shoulder like flowing water.

The nightgown was half-fallen, with only the other thin strap supporting it, which looked a little strained.

Then my sister spoke: "Brother... didn't you want to know my nickname?"

Her voice was charming and seductive.

I didn't dare to breathe and waited silently...
Last night, my sister came to my room.

She was wearing a white shirt, her two chubby little legs completely bare, making me blush and my heart race.

"Sis, what are you doing? Can't you act like a girl?"

Unexpectedly, my sister had no self-awareness whatsoever. Right in front of me, she slowly unbuttoned her shirt and took it off, leaving only two thin pieces of underwear covering her petite yet mature body.

The underwear was white, a very innocent style, a stark contrast to my sister's wanton behavior.
"Brother, make love with me."

My sister straddled my lap, her hands on my shoulders, her buttocks wriggling as if it were itchy.
"Nonsense! How many times do I have to tell you! Even if I die a virgin, I'd never do anything like that with you!" I held my sister's buttocks, wanting to throw her off, but I couldn't bring myself to do it.

My sister's eyes were glistening, and she looked at me with a pitiful expression, saying plaintively, "I've begged you like this, and you still don't understand my heart?"

I touched her smooth, soft thigh and sighed, "How could I not understand? But I can't help it. How can I make you understand?"

My sister pulled my hand to touch her breasts, but seeing that I had my eyes closed as if dead, completely unmoved, she gritted her teeth and said, "Fine, I won't force you."

Hearing this, I happily opened my eyes, but then felt apologetic, so I squeezed my sister's full breasts as compensation.

"But I have one condition," my sister added.

I was startled by her words, and my fingers accidentally slipped inside her bra, pinching a soft protrusion. "Ah... what's the condition?"

my sister said. "I'll give you a riddle. If you guess it right, I'll never bother you again. If you can't guess it... then you have to make love to me."

I rubbed the small protrusion with my fingertips while closing my eyes and thinking for a long time before saying, "Okay, I agree. Give me the riddle."

My sister's hips stopped moving, she must be getting serious. I heard her say in a leisurely voice:

"Guess a person. This person can not only protect his country, but also protect all the beautiful girls in the world."
"When he was born, the whole world rejoiced for him; when he died, only one person was left to weep for him."

"He might not be very tall, but his penis is the biggest in the world."

My sister said, wiggling her hips again. "I can only give you an hour to think of the answer. This hour might be the last bit of passion I ever have..."

I pulled my sister closer, burying my face in her breasts, pondering. "The answer is a man, hmm, who protected all the beautiful girls in the world? He must be a hero or something, a hero with a big penis..."

A flash of inspiration struck me, and I looked up. "It's Itsuki Hashima, right? He transformed into a hero with a big penis in episode 11 of the first season."

My sister frowned. "Who? No, no."

At this moment, my sister's hips tilted to one side, rubbing against my left leg, making my leg go numb.
So I reached out and hooked her arms under her armpits, lifted her body up, and placed her on her right leg. My sister swayed even more violently, but my right leg was stronger and could hold on.

My sister breathed slightly and said in a sweet voice, "Don't guess randomly, you only have one chance left."

I was unconvinced and slapped her bottom: "Who said it's only now that it's set?"

My sister seemed oblivious, pulling my hand down onto her buttocks, not letting me let go.

Helpless, I buried my face in my sister's chest again, taking a few deep breaths.

Although I guessed wrong earlier, I had a feeling I was very close. What was the answer?
My face was pressed against my sister's warm breasts, my hands were squeezing my sister's soft buttocks, and I could hear my sister's alluring panting. I suddenly felt extremely happy, as if it was better not to guess correctly.

A sudden realization dawned on me, and my head jolted open—I knew the answer!

I grabbed my sister's arm and looked intently into her eyes: "I guessed the answer."

My sister stopped moving, her body completely still, her eyes incredibly gentle, her pearly teeth slightly parted: "What is it?"

I smiled wryly for a moment before saying, "I... I can't say, brother gives up."

My sister jumped excitedly a few times, her buttocks slapping my legs with a loud slapping sound. She then hugged my forehead and kissed me wildly, only gradually calming down after a long time.

My sister wrapped her arms around my neck, nestled against me, and asked with a tender smile, "Okay, now you can tell me the answer. Let's see if you guessed correctly."

I stroked her face, my fingertips tracing down her neck, breasts, waist, and hips, then gently circling her thigh. Only then did I speak softly,

"The answer is your brother, which is me. Your brother can protect our country, but he also protects all the beautiful girls in the world of anime."

"When I was born, the whole world rejoiced for me, but when I die, only you will be left to cry for me."

"Your brother isn't tall, and although my penis isn't small, in your eyes, it's the biggest penis in the world."

I said deeply, "Did I guess right?"

My sister just hugged me tighter and hummed in agreement.

Although I knew the answer, I couldn't say it. My sister loved me so much; how could I watch her cry alone for me? I couldn't do it, and I didn't believe any brother in the world could bear to do it.

Touching my sister's soaked panties, she let out a soft moan and said seductively, "Brother, no..."

"Wasn't that enough?" I said, capturing her lips in mine. Neither of us spoke again.

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