Awakening Puberty

“Oh, I get it, then you do like this here...”

Recently I have been going to my little sister's room to help with her studies every night. End of term exams are in two days. Going into her second year of middle school she was already concerned about her grades for getting into a good high school, and had taken to studying in a way that didn't fit her normal character.

“I did it!” After each question I would check her answers. “Huh? This answer is wrong?”

“Your last addition there is wrong.”

“W-What? Eh...eheheh ♥” My sister Mai grinned with embarrassment as she fixed the answer. Watching her work hard at her studies made me feel strange. Now that I think about it, it's been years since I had reason to come into her room, let alone sit with her like this.

I guess that's just what happens when you become a teenager. Back when I was entering middle school and Mai was still in elementary, she'd ask me with tears in her eyes, “Why won't you play with me any more?” And now she too is becoming a teenager. I expect that it's pretty embarrassing to ask me for help with her studies, but she's accepted the hit to her pride to achieve her goal. I guess she's grown up a bit while I wasn't looking.

And she's become pretty too. She's very cute, but she's my sister and nothing more. I've never really thought of her in any other terms, but looking at her now, she's actually quite beautiful. I've even heard that she is pretty popular. So I feel a bit weird, but in the end I'm just helping my sister. It's really no different from when I changed her diapers when she was a baby – it's just the duty of an older brother. That is just my fate.

And yet... for some reason I feel my heart race a bit, as if I was sitting next to a girl in class that I was somewhat interested in. It's odd, because for one thing, I have a girlfriend. Just last month I finally began dating a girl that I had been interested in. So just what was I expecting from my sister?

“Onii-chan, what's wrong?” She turned her head to look at me.

“N-Nothing. Go ahead and do the next one.”

“Haa~, but I'm tired....”

Looking directly at her, it was clear that her face was very neatly arranged. Her hair was cut short and seemed to draw the eye to appraise her features. And her figure is great. It's shocking how clear and smooth her skin is, especially since we eat the same things every day, and lately her chest has begun to expand outward. She's wearing one of my old t-shirts, and the loose collar was giving me a peek at the growth that had clearly been taking place. She'd begun to change from a girl to a woman before I even realized it. I regret not paying more attention now...

The problem, however, lies below....

My little sister, you see, is a futanari. Lately it's been popping up in the news all over the world, the birth of those with both sets of genitals. In other words, they have both male and female parts. They're apparently increasing in numbers, and while they are rare in my own generation, Mai has several other futanari as her classmates.

As a result, Mai had suffered all of her life. In her pre-school she hated the futanari swimsuits, “Noo!! I wanna wear the normal one..!!!” she would scream angrily. When she was in elementary school she came to my room one day unexpectedly, and she was clearly nervous. “Onii-chan, what do I do... I was touching my penis and the skin peeled back...” she said, as she began to cry and lifted her skirt to show me. “It... it won't go back! It's so embarrassing..!”

That was the last time I saw her penis. At the time it was shaking with her sobs, but her penis had been so small and a cute pink... I wonder how it was now.... And by the way, I have phimosis, but luckily not too bad. So at that time I began to feel it –

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