"I have a solution." (She grabs a diaper)

Much to Erza/Juvia's shock, Lucy came back with an adult diaper.

"What's that for?!"Erza/Juvia yelled in apprehension.

"Sorry, Juvia. It''s just you clearly need better control over your body, so I'm giving this to you." Lucy said sincerely.

"Just because I pooped a little in your panties?!" Erza/Juvia yelled incredulously.

"You also did a number on your panties and ruined your clothes. I'm just glad you didn't ruin the maid outfit. Now, put it on." Lucy demanded.

What does Erza/Juvia do?