義妹だからできること、妹じゃないとダメなこと。

The girl, who knew my secret that should never be revealed to anyone, hinted at a honey-like threat.

"I'll do what you can't do with your real sister."

And so, that day, I pinned her down.

A one-time mistake.
A one-time compromise.
A moment of intimacy.

That was how our relationship was supposed to end. That was how we were supposed to go back to being strangers. But, at the time, I had no way of knowing.

"I'm happy to meet you again, (step) brother."

The girl I thought I would never see again ended up becoming my step sister.

This is the story of the worthless me who's in love with my real sister, and my troublesome step sister who's too attached to me. And of an ordinary little sister who's bothered by our relationship.

I'm sure that's all there is to it. Probably.

[Translated from Digiket]