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Destiel fans see parallel's between Dean and Castiel's arc in Purgatory to that of Orpheus and Eurydice in Greek mythology.
From a meta essay that also looked at
parallels with Sam and Eileen, [https://naruhearts.tumblr.com/post/189715501541/the-purgatory-spell-in-15x08-love-death-and-an Naruhearts observed] "Orpheus (Dean) could not bring Eurydice (Cas) with him, not because, like Orpheus, he doubted and looked behind him (thus trapping Eurydice in Hades) but because Cas did not think he deserved happiness topside with Dean, because of his sins as Godstiel, and so he tragically let go of Dean’s hand deliberately at the last moment."
Fans noted however that this left out an important figure in [[Benny]]. So [https://donnasweett-remade.tumblr.com/post/635129685593948160/what-if-orpheus-and-eurydice-had-a-third-guy-with DonnaSweet] coined the delightfully descriptive term "Orpheus’s gay Cajun vampire sidepiece" to refer to Benny.