Ed's first instinct is to object-- Izzy’s move to make it more credible is a good one, but moreso, he's unknowingly pulled at Ed's heartstrings. Ed only has one thing to remember his mother by, tucked tightly and carefully inside his clothing and against his heart where no one can see it. Losing such an item feels like losing his own life, and so he understands.

The words that he'd been about to say before hearing Izzy out break off and fall to nothing, and instead Ed just nods. "Curaçao it is."