Mogana will go along with an invited kidnapping... for the right price, but it's usually less painful than trying to take her by force if she gets a chance to fight back. She's definitely one who needs to be at least partially gagged to keep her from using her powerful voice during the binding process. Bonus points for tying her up in her swimsuit as her breasts and hips are both emphasized, accessible, and are her weak spots. For her gag, definitely go with something heavy and don't worry about it being too heavy as she's fully capable of holding her breath for longer than she's held captive. So long as she enjoys the situation enough, she may even waive the fee after a while.