There was one of those attractions on Peach Castle and in the town and Bowser was invited for a special attraction for those special people! When you do the attraction Bowser will explain what you can do with his paws! Of course nothing naughty since well... This is a public attraction of course.

Big shoutouts to  DbzDr for helping me with the quality of the render

Bowser model and Galaxy Peach Castle model by SAB64