She likes them

Elm Ederne, the strongest member of the elite team of Huntsmen and Huntresses known as the Ace Operatives, was currently sitting on the floor wearing nothing but a pink t-shirt and a thick diaper with alphabet prints on the front while playing with some baby blocks.

While one might not see it from her cocky attitude, Elm had a lot of stress from having to take on several daunting tasks assigned to her team by General Ironwood, and found that this was one of the best ways to relax, acting like a carefree baby girl... who happened to be able to bench-press five times her weight on a bad day. Granted, not a lot of people knew about what she did in her free time, expect her fellow Ace Operative, Harriet Bree, who was coming in to check on Elm with a bottle of warm milk in her hand.

"How's my little sprout doing?" Harriet asked playfully, causing Elm to nod as a non-verbal way to show her content. As Elm was playing, Harriet took the chance to check Elm's diaper.