She seems to have some sort of obsession with him.

I know what it's like to be the focus of someone's obsession.

The work of obsession, as carried on by you, should be done in every town and city.

But it's a bit of an obsession to do something that hasn't been seen before.

It grew into a kind of obsession with me- to see what he was like!

But he wasn't prepared for the level of the man's obsession.

So size is something of an obsession, and now a professional concern, too.

His first 100-yard game, for instance, became something of an obsession.

In the end it was the strength of his obsession that won.

Maybe the need to find these connections has become a bit too much of an obsession.