Not sure how happy I am with this, but wanted to get my thoughts out.
[X] Plan "You want the truth? You can't handle the truth!"
-[X] "You became my business when I plucked you from the deck of a ship rather than crushing you like an overripe melon. You sailed against my lands to bring death and destruction to all that I have built here, to murder my friends and family. I care not for your justifications, for your duty to the Usurper, your lout of a brother who would as soon piss on you as speak a kind word in your favor. Understand that I have been merciful in my dealings with you, far more so than I could have expected were our situations reversed. Despite your crimes, I have treated you with greater respect and honor than the Usurper ever has or ever will. Think on that, Stannis Baratheon."
-[X] "You will not leave this island before the ransom is paid. The Usurper cannot be bothered to secure his brother's freedom for a sum less than he will spend in a single season of tourneys and feasting. The being now known as Renly Baratheon, however, is more than willing to pay for your release, so eager is he to see his brother freed."
-[X] "That same being has all of your younger brother's memories, but rather than being a pale reflection of a reluctant boy lord, he is everything that the Renly you knew is not, a wise, just lord, well-loved by his people and bound by honor, such that upon learning of his true nature, he was devastated and immediately thought to abdicate to you. He is no spirit, no puppet, and he certainly no usurper, for it was your younger brother's own desire which placed him in Storm's End, to rule for him, to take his place because he was too weak to bear such responsibility."
-[X] "That said, I have no interest in seeing the Seven Kingdoms, a land united by my ancestors after millennia of fruitless conflict, brought low by civil war, nor the machinations of fiends and even darker powers. Will you restrain your pride and bullheaded arrogance long enough to speak with the being who until just a few minutes ago thought he was the true Renly Baratheon?"
-[X] "Before immediately jumping at the chance to take your ancestral seat at Storm's End, consider the Usurper's reaction to learning of these events. Do you think he will leave you in control, or perhaps appoint a Lannister as castellan until one of the royal children is of age?"