Oh hey, the suggestions are rolling in! This goes out to krithikav- I realise I've been neglecting the womenfolk, so I took your suggestion and wrote about our favourite female character (note sarcasm.)
Appreciation goes out to Veridissima for her lovely review. :)
Dearest Myrcella,
A woman's weakness is her child. Do not be deceived by their innocence. Love them, but from afar. Anyone who is not you is the enemy.
Remember that, and power will never leave your hand.
Kisses,
Mother
I thought about writing to Jaime, but I remembered what she said to Sansa about a mother's love for children. And I'm pretty sure that would surpass any love she would feel for a man.
In the end, I think she would regret what Joffrey became, and what she lost in the process. At least, that's what I think.
Hope you liked it! :)