What would be Fortunato's perspective if he were the narrator of "The Cask of Amontillado" by Edgar Allan Poe?

Fortunato would be mainly interested in what there was for him to gain out of Montresor's request for help. Montresor tells him two important things. One is that he bought a whole pipe of Amontillado, 126 gallons, at a bargain price. The other is that he is on his way to Luchesi to get his opinion of it. Montresor has already paid for the wine and had it transported to his palazzo. Why is he so anxious to get an immediate assurance that it is genuine? It must be that he intends to buy more if he is sure it is genuine Amontillado. He says he was looking for Fortunato but couldn't find him, which is why he is hurrying to find Luchesi. Obviously Montresor wants to buy more of the wine before news gets out that it is available at a bargain price.

Now Fortunato knows that the Amontillado is available at a bargain price. He does not want to show any interest in it because he would like to buy up the entire shipment himself. He realizes that it must have arrived in Venice aboard a Spanish ship from Barcelona. He doesn't need to go to Montresor's palazzo to taste the wine. He could just go to the docks and ask about a newly arrived Spanish ship. He could taste the wine aboard the ship to make sure it is genuine Amontillado, and then deal with the captain or purser on the spot. Fortunato is a rich man. He could afford to buy the entire cargo. And he thinks he could get an even better bargain than Montresor had gotten, since he would be offering to buy the entire shipload.

But if Fortunato declines to accompany Montresor to his palazzo, he knows Montresor will go straight to Luchesi--and then Fortunato would find himself competing for the Amontillado with another rich man who is also a connoisseur of wine. So Fortunato has to go to Montresor's palazzo primarily to keep Luchesi in the dark. Fortunato's perspective should reveal that he has no intention of telling Montresor the truth if the wine is really genuine. He intends to sip it, frown, shake his head, and say that it is only ordinary sherry.

Montresor's palazzo from Fortunato's perspective would look shabby. He would note that the servants had all left to take part in the carnival. His perceptions would be distorted because of all the wine he had been drinking. He would eventually find himself chained to the granite wall of the catacombs and would realize that he had been tricked. He would sober up quickly and think about how he could talk his way out of the fix he was in. He would try examining the chains and padlock in the dark. Then he would become panicked and start trying to break the chain or pull one end out of the rock. He would try screaming for help. He would try talking to Montresor, pretending he was taking this as a clever jest, hoping to plant some doubt and fear in his enemy's mind by suggesting that he was expected at home by a large group of people including his wife, relatives, guests, and servants. But in the end he would find himself walled up in a narrow niche listening in vain for the sound of approaching footsteps which might mean that Montresor had had a change of heart and was coming back to set him free.

Since Fortunato would have nothing with which to write his thoughts, his version of the events would probably best be handled as an interior monologue or else as straight stream-of-consciousness. Some of the same dialogue could be borrowed from Poe's version of the story. The most important difference would be that Fortunato would be thinking of tricking Montresor, whereas in the original version it is Montresor who is thinking about tricking Fortunato.