obsessenation 

A cross between obsession and fascination

Example 1- "I've got a total obsessenation with this band"

Example 2- "dude, what is your obsessenation with her?"

obsessenation by geezabird February 22, 2009

obsessination 

Obsession, usually by conspiracy theorists, with the John F. Kennedy assassination

So much has been written about the grassy knoll, the second gun, Fidel Castro, The FBI and other obsessinations.

obsessination by snootifox May 11, 2018