Candide has been locked for weeks now and she is very frustrated.
When she dominated Lucario she tortured him almost every day, but knowing how lustful she is, he decided to reduce sexual interaction with her to a minimum.
Candide has grown to be a complete pervert over the last month tormenting Lucario so this punishment hits her very hard.

She tried everything to give herself pleasure to no avail. She isn't the type of girl who enjoys touching her breasts of nipples, she finds it quite painful and not in a sexy way, that's why Lucario never touches her here, This makes her situation even worse because it's the only sexual area of her body that she has acces to right now.

Look at her ! She is home alone and decided to wear her maid uniform, it seems like this is the last thing that can stimulate her. She really is desperate.
Maybe she'll be nicer with Lucario next time...