sorry to but in, but the way you make desire a problem is just to show how desire is causing conflict within the story.
-My desire for a car has driven me to become a thief.
John: I can't believe it. My desire for a car has driven me to take money from the church offering plate. I'm so ashamed. I'm so conflicted.
-My desire for a car causes others to see me as shallow and materialistic.
John: I sure would like a new car._
Marsha: You already have a car. There are people who are starving to death as we speak and all you can talk about is this new car you want. You're so shallow and materialistic. I'm going to hang out with Gary. He just spent three hours helping out at the homeless shelter giving his time freely.
John hangs head in shame.
-My desire for a car is clouding my judgment.
John: I sure would like a new car.
Pharmacist: Sorry, pal. I don't sale cars. I fill prescriptions. If you want these psychotropics, you'll need to pay me this much for them.
John: But if I pay you that much, I won't be able to afford a new car for another month. I think I'll just hold off on the psychotropics until then, thanks.