Obsession

To be obsessed is to have an addiction to something or not to be able to think about anything but one certain thing. I have read many stories of people who have pet sugar gliders and become addicted to them, and all they can think about are sugar gliders.

Image from: http://www.gotpetsonline.com/pictures-gallery/exotic-pictures-breeders-babies/sugar-glider-pictures-breeders-babies/pictures/sugar-glider-0012.jpg