Looking for a story

Hi, I've been looking for a story for around 2 years now and I haven't had any luck so wonder if any of you know where it is. I've been using the way back machine and haven't had any luck. It's a story where a boy inflates girls just by saying their full name. One happens in a waterpark where she gets stuck in a slide and the other gets inflated in a music room. Any help on trying to find it will be very much appreciated.