Mayu may be loud and feisty, but she doesn't have the physical strength to put up any serious degress of resistance. That doesn't mean she's an easy catch as she does have bodyguards for protection. She's also a bit of a tsundere, so earning her trust can take a while, but it's easier for one who can empathize with her loneliness. Her body isn't fully developed yet, but her eyes and hair are the best things about her anyway. Use rope or some other comfortable material to keep her satisfied and a cloth gag over her hair for silencing.