Weakness

It's a terribly unfair tactic.

She feels a little guilty.

Nonetheless all's fair in love and war.

She's found that he has one undeniable weakness. From discussions around the women's bath it seems to apply universally to men.

After sex he's remarkably compliant.

It's an interesting state of consciousness, highly susceptible to suggestion.

Of course as a kunoichi she's been taught this. Much successful espionage occurs in the bedroom. The mind of a sated lover is much more willing to give up its secrets.

But it seems… dubious…using it against her husband.

"Shikaku," she whispers. "We need to paint the kitchen."