I am not sure we need allegories or parables for explaining Epicureanism. It might be best to be more straight-forward on most ideas within Epicureanism.
I found definitions:
"There are a lot of stylistic devices that are used in literature. Two examples are allegories and parables. Both tools are used to help someone present important messages, key lessons, and linguistic tools. Even though many people believe an allegory and a parable or the same thing, there are actually some major differences. An allegory is usually an image, poem, or story whose interpretation can communicate a hidden meaning. In contrast, a parable is a simple story that is used to illustrate moral or spiritual lessons." Source