Nonsexual objects can become sexually arousing if they are repeatedly associated with pleasurable sexual activity. Well I am glad we got that out of the way. I still don't know why I like tying up women's clits. I always thought it was because I wasn't allowed to build a ship in a bottle when I was young. Maybe my parents worried that the bottle would become a sexual arousing object.
Paraphilias can, and often do, become highly idiosyncratic and ritualistic.
Of course they do. A paraphilia is distinguished by a preoccupation with the object or behavior to the point of being dependent on that object or behavior for sexual gratification. In most cases, types of sexual activity outside the boundaries of the paraphilia lose their arousal or satisfaction potential unless the person fantasizes about the paraphilia at the same time. Fantasies are healthy. Drag it from the realms of the dark imaginary into the cold hard light into full view.