Rainbow Dash: Why do I have to do this!?!
Spitfire: It's part of training to be a wonderbolt to be able to lift a huge load
Rainbow Dash: But why did it have to be a dirty diaper!?!
Spitfire: Because it's part of the dress code to wear Diapers under the suit, and you need to be prepared in case the inevitable happens, now finish your laps, you have 498 to go

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Sketched by  liljdude