I Raised The Beasts Too Well

Summary 

I became the childhood friend of the lost twins from a grand duke’s family.
Originally, those twins were supposed to grow up suffering in an orphanage.

One day, the grand duke found out the truth and, in anger, burned down the orphanage to find his children.

…Whoa, that can’t happen! I wanted to live, so I did my best to take care of the twins.
Every day I read them books, stole food for them to eat, and protected them whenever the headmaster tried to hit them.

Because I wanted to survive!

Thanks to that, the twin brother was the first to be taken back to the grand duke’s family.
Except for the twins’ tragic childhood changing a bit, everything else followed the story’s plot.
I managed to survive until the brother grew strong enough to return and bring his sister home.

And finally, the grand duke came back with the twin brother.

“My son is here.”

Wait—what? The one who was adopted first was supposed to be the brother, right? But something seemed strange…
The “brother” now had long hair?!

“Yes! It’s me. I’m your son.”
“Good. Let’s go home.”
“Wait. We have to take her too.”

The twin who had always been with me suddenly grabbed my hand.

“From now on, you’re mine. I’ll protect you.”

Something had gone terribly wrong.
The child I’d raised so well… turned out to be a boy?!