"Make me more and more undignified!"

The heroine, Sumire Misaki, born into a family of educators recently became a teacher.
As a woman she was very diligent and commanded respect.
She managed her classes without a hint of emotion.
The students began to call her the Iron Mask.

One night, Sumire saw a woman naked in the street.
The woman was her total opposite. Uninhibited and sexually free.
Sumire's eyes were opened. The forbiddenness. The humiliation.
Her body yearned for such a thrill. Sumire became aroused.

She timidly exposed her skin, and was instantly in love with the fetish.

Once she had a taste, her obsession grew.
Sumire was quickly unable to be satisfied by just a little flash of brassiere.
"I know it's wrong, I'm supposed to be a role model.
But I can't control myself."

How far will the new teacher go?

[Slightly edited from DLSite English]