Stratagem

After accompanying her father, King Robert Baratheon, and his party to Winterfell, Delmara makes the... misfortune of meeting the dreaded Lord Roose Bolton while out for a ride. In a desperate attempt to escape death, she launches into a half-baked plot to secure an arrangement that would work to both of their benefits.
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Despite taking many cues from all three media types, most of the character ages follow more closely with the show for ease of writing. Roose Bolton is more modeled off of his book counterpart, and the Telltale Forrester family will be making appearances here and there, as applicable.

So, in the show, Cersei mentions how, before Joffrey, she'd birthed a son who was genuinely Robert's, I got to thinking, what if the stillborn had a twin sister who survived? How would things be different if Robert had a trueborn daughter? And that's kinda how I created Delmara. At the time I initially thought of the concept, I was on a major Roose Bolton kick, and that's how he got thrown into the mix.

Also, there is some early ship tease with Jon Snow. Because it's Jon Snow ❄️