New Shakespeare references!
(And for once it isn't Romeo and Juliet)
Another romance, but this one far different in tone, themed for revenge and forgiveness, with the final outcome being that Prospero comes to forgive his brother Antonio for all that he had done rather than relentlessly persuing absolution, even with the absence of an apology.
The theme of Prospero seeking to take vengeance for being usurped by his own brother seems rather intentional, given the current plot, as is even addressed by the characters-
And even Ciel has something to add this time. It would seem that he's actually been learning about Shakespeare. Back when they first met Grelle, he had no idea.
Technically, O!Ciel has already usurped R!Ciel, so despite the similarities of a brother's vengeance, the topic of the play could be pointing more towards O!Ciel and Sebastian being the ones currently 'trapped' to be punished for R!Ciel's own previous 'exile' (his death).
If the eventual conclusion of the play is to be mirrored with our characters in these places as they currently see them, though, then O!Ciel would eventually see fit to forgive his brother, following the prior advice that he received from Sebastian on 'being kind', just as Prospero does so after heeding Ariel's words to be 'tender'.
And also, keeping Ciel and Sebastian in the roles with which they have already associated themselves, there still remains the undertone of a relationship stronger than that of a servant and their master between the two.
