(In the vein of 'Ellie in a messy diaper' artwork:
https://omorashi.org/gallery/image/1...ie-super-mess/)
Since I prefer a hint of malice and embarrassment with my roleplays, how about the person who "Suggests" that Ellie wears diapers is also the one in charge of rationing equipment and supplies, and therefore also gets to decide when and if Ellie gets clean diapers?