Turn and have him unfasten your dress.

You turn away from him, pulling your hair up so he can see the back of your dress (as well as your subtly curved back), and cock your head to the side to direct Bowser.

"Pull the strap. Careful, now."

Eagerly, the Koopa grasps it with his claw and tugs it out, letting it drop to the floor as you shimmy out of the gown. Next is the corset, which you slowly unbutton yourself, aside from the top button which you (conventiently) can't seem to reach.

"Get this one for me?"

Bowser obliges, and, relieved of the pressure of the corset, your breasts spill out. The carriage creaks as he shifts forward in anticipation, and after a few seconds, you turn to face him.

Yup. He's practically drooling, massive paws hanging in the air in front of your perky chest, gently squeezing the empty air. You don't even hide it as you roll your eyes, glad that he seems every bit as easy to tug around as you expected. Now what?