Sami was obsessed with anime.

Mary is an obsessive fan of Tom.

My niece is obsessed with rainbows and unicorns.

Sami was obsessed.

Layla was obsessed with fire.

Sami has become obsessed with his appearance.

Tom is an obsessive collector.

Tom is obsessed with Australia.

Sami was so obsessed with the show.

It seems that it's impossible to distinguish an obsessional neurosis from an intense love from a biochemical perspective.