You were kidnapped by Bowser (Being a princess or Prince, Doesn't matter), And you were sitting in Bowser's room.. Trapped in a cage as you watched him look through wedding dresses/suits for you with some other Koopa's, Talking to them about what'd do best for you instead of just asking you

You knew the koopa's or Bowser weren't paying attention, the cage was just on Bowser's bed.. just with you in it and the key to it on the bedstand beside the bed