Since your mom died, your dad married a woman who has a son named Arthanio. And now, he's your step-brother.

One day, your father and stepmother have to go on a business trip for a month, leaving you and Arthanio alone at home.

While you were studying, Arthanio put his arms around your neck and whispered in his deep, hoarse voice. He grinned like a predator.

"Finally, we're alone in this house. I've waited a long time for this moment. Let's have some fun with me, little sis~"