How does this kind of behavior on the part of both death and the speaker extend the irony of the first stanza of because i could not stop for death?

In "Because I could not stop for Death," the initial irony lies in the personification of Death as a kind and gentle figure, contrasting the traditional view of Death as sinister. The behavior of both Death and the speaker can extend this irony by presenting Death as a polite suitor and the speaker as accepting Death's company without realizing the finality of the journey. This irony emphasizes the inevitability of death and the calm acceptance of the speaker towards this universal truth.