Iinazuke wa Imouto-sama!

One day, my sister challenged me to a game of Roshambo (Rock-Paper-Scissors-Hammer)! As her older brother, I couldn't back down from a challenge... but I decided to add one special condition.
The loser has to take off one piece of clothing. It’s a strip-match!

One day, my sister challenged me to a game of Roshambo (Rock-Paper-Scissors-Hammer)! As her older brother, I couldn't back down from a challenge... but I decided to add one special condition.
The loser has to take off one piece of clothing. It’s a strip-match!

There was once a demon lord who ruled over a world far away. On the verge of being slain by the hero Ema, the demon lord, in a desperate attempt to survive, used what he believed to be teleportation magic. However, instead of escaping, he was transported to another world—his body mysteriously shrinking in the process.
To make matters worse, he had turned into a little girl.
Stripped of all his powers and magic, he found himself being chased by men, trapped in an unfamiliar world with no way out.
In this dire situation...
"...Are you okay?"
Out of nowhere, a voice called out to him. It was the very hero who had cornered him, but she too had been transported here—though a year earlier.
Now, the demon lord, lost and powerless, had no choice but to rely on the hero for survival. What kind of chaos will unfold as the demon lord, now in the form of a little girl, is taken in by the hero?
The hectic life of the transformed demon lord and the hero begins.

“Welcome home, big brother.”
It had been several years since I’d returned home. The first person to greet me was my younger sister, Nana.
Even though I knew she was my sister, my heart was racing at how much she’d grown into a woman.
When I left, she wasn’t exactly feminine, to say the least. But now…
“What am I thinking…? She’s my sister, you know?”
It was late at night. I heard the sound of a door opening outside my room.
Footsteps soon followed, so it was probably Nana coming out.
“You’re awake?” Perfect. If she’s still awake, let’s talk for a bit.
I thought she’d gone to the bathroom or get something to drink, but… Nana was in an unexpected place. “Nana, where are you going at this hour?”
“Uh… well… I was thinking of going to the convenience store to do some shopping…”
“Does it have to be today? Couldn’t you just get up early tomorrow morning? Or is there something special happening today? If so, I’ll go with you.”
“Um… ah, well… you see… I mean, that’s not good. I mean, I’d like you to wait for me, big brother…”
I felt a sense of relief.
Only her body had changed; her personality was the same as before. She was still my slightly timid little sister.
“–Nana, promise me one thing. That you won’t do anything to worry Mom and Dad.”
“Big brother… Yes, I understand. I’ll be going now. Thank you, big brother. And I’m sorry…”
Several weeks passed.
Nana went out at night frequently.
But for now, I had no intention of scolding her. I didn’t have any intention of doing so…
Then, I received an email that signaled the beginning of that nightmare…

As a form of payment for your father’s debt you were bought by a female young lady and kept as a dog.
Can you withstand the temptation of her big tits?