So she's still kidnapping Peach, but to get rid of the competition and give Mario a reason to come visit her.

BBW turtle-dragon is still very nice. Though she seems to be missing her shell.

Well, we are talking about a master rule 34 artist here.

Maybe her shell is actually a slip-on she only uses for battle?

There's another picture that suggests it's actually Peach who regularly kidnaps Bowser but, ah, I can't upload it due to toplessness.