By falling asleep when teaching at the academy

Tsunade was supposed to give a lecture at the Ninja Academy about discipline, but ironically, she fell asleep at the desk.

Oddly, the classroom was full of boys, and while they didn't now how to react at first, they soon got a little excited.

It started when one of them walked up to her, and poked her breast, making it jiggle. When she failed to react, they all got excited, and stripped her naked.