One Battle Shocks the Nine Skies

A lone man and woman stand on a hilltop, a breeze stirring a few strands of hair. The woman suddenly turns back and, as if recalling something, asks, "Do you have a younger brother?"

The man freezes, his eyes flickering as though he has thought of something, and answers, "Of course."

The woman asks, "How old is he?"

The man frowns, looking at her strangely, and asks suspiciously, "Do you really want to know?"

The woman says, "Of course."

The man hesitates, but when he sees her eager expression, he softens and then puts his hands behind his back and says, "About eighteen centimeters, I guess."

Hearing this answer, the woman is also stunned, but she reacts quickly and, unlike usual, licks her lips seductively and says, "I don’t believe you! Unless you let me calculate it orally."