Choosing the right one

You(female reader) as a marine and a warlord's story...

You're one of the 7 chosen marine rookies with a high potential and has a high chance to be promoted as a marine captain. And it is one of your greatest dreams..But before that, you and the others needs to undergo first a one on one training with one of the 7 warlords of the seas. A new obligation for the Shichibukai to teach marine strong rookies... Then you pick his name D.D... Is he going to teach you how to fight or is he going to be an annoyance only for the whole 3 months?