In The Cask of Amontillado how does Montressor lure Fortunato farther and farther into the catacombs?

Montresor appeals to Fortunato's pride and vanity as a connoisseur of wines when he tells Fortunato that he has what might be a rare wine known as an Amontillado. He tells Fortunato that he will ask another person, Luchesi, to advise him if the wine is a genuine Amontillado. Fortunato's vanity makes him insist that he, rather than Luchesi, be the one to do the testing because he is a much better judge of wine than is Luchesi.