Years and years ago, I read a series of books in which two children, a boy and a girl, are sent/fallen/pulled into another world of fantasy through bodies of water. The boy's name is Ainsley, but I can't remember the girl's name. In one of the three books the boy is transformed into a dragon or something via magic, and eventually he is transformed back. In the third book there is a wizard, or old man, who guides them towards a gem/pearl/stone that embeds itself in the girl which grants her magical knowledge which ultimately prevents her from returning home.
Megan and Ainsley have lived next door to each other their whole lives, but their relationship is anything but neighborly. Ainsley is the cutest, most popular guy in school, and even has a group of girls who call themselves his fan club. Outspoken and fiery, Megan is an individual who thinks Ainsley is full of himself-and she doesn't mind letting him know what she thinks. The two stumble upon a neighbor who is performing some sort of strange magic, and find themselves transported into a magical new world. Stuck together in an unfamiliar land with no escape, Megan and Ainsley encounter floating cities inhabited by magical creatures of all kinds-and find themselves pursuing a thief who has stolen a staff with magical powers. Can Megan and Ainsley work together to find the staff of power and save the kingdom, or will they find that there is no escape from Arylon?