I absolutely love it when a ticklee wants more, especially on her feet. So far, the only story I have been able to find is one where a woman is caught in a spider's web, and her interriegator uses a special potion on her to where she actually begs for more tickling, and only gets it when she gives the information (See posted link below). If anyone either knows of any more stories like this, or is willing to write one (The ticklee must be female, and the main focus needs to be her feet), I would be much obliged. Thanks!
http://www.ticklingforum.com/showthread.php?t=154413&highlight=spider+web
http://www.ticklingforum.com/showthread.php?t=154413&highlight=spider+web