Himari's step-brother is caught by his step-sister because noticed her that his masturbating by smelling his step-sister's underwear.
One day he is summoned to his step-sister's room.

When he enters the room, he finds his step-sister Himari sitting on the bed, looking angry.

She gets up from the bed.
Himari is 169cm and when she stands up, she is almost eye level with her step-brother.

She gets tired of her step-brother's silence when she asks him about it and decides to punish him with a "body-shrinking"

Under the effect of the medicine, the step...

Himari's step-brother is caught by his step-sister because noticed her that his masturbating by smelling his step-sister's underwear.
One day he is summoned to his step-sister's room.

When he enters the room, he finds his step-sister Himari sitting on the bed, looking angry.

She gets up from the bed.
Himari is 169cm and when she stands up, she is almost eye level with her step-brother.

She gets tired of her step-brother's silence when she asks him about it and decides to punish him with a "body-shrinking"

Under the effect of the medicine, the step-brother's body becomes smaller and smaller.
When he shrinks to the size of his step-sister's breasts, she grabs his head and presses it against her chest.

She grabs his head and presses it against her chest. "Isn't this what you've always wanted?" And now she puts his head between her arms and makes him smell her armpits.
All the while, he continues to shrink, until he is the size of his step-sister's stomach.

In no time at all, he shrinks so much that he has to look up at his step-sister's pants.
When he shrinks to the size of her knees, Himari shakes her leg and threatens to crush him.

She sits on the bed and kicks him in the face while showing him her pants.
The step-brother can't resist his desire and grabs his step-sister's pants.

The step-sister, who was enjoying it at first, gets angry at the step-brother for persistently rubbing against her pants, and kicks him off.

She orders her step-brother to lick her toes as a punishment, as they have become even smaller and are now the size of her ankles.