Um. This is in-character, mostly, I hope. I don't really know how this happened. Curse my embarrassing affinity for babyfic!
Birthday
"So what kind of bender do you think he'll be?"
Azula looked up from gazing at their tiny son. "Sokka, he's only three days old. I think it'll be a while before we can tell."
"True." Reaching into the basinet, Sokka carefully picked up Zakku and cuddled him a little. Azula, while she did love her son, was not an especially affectionate person, so Sokka was determined to make up for it. "I just think it'd be neat to have a waterbending son, that's all."
Azula rolled her eyes. "Yes, that would certainly go over well, wouldn't it? The firstborn of Princess Azula of the Fire Nation, a waterbender."
"If you were really worried about that, you wouldn't have married me," he replied playfully.
Nodding, she replied, "Touché," and reached out to take the baby from him. The entire nation had been shocked when Azula had publicly announced her engagement, not that she'd cared. She'd cared even less when the announcement of her pregnancy just three months after their wedding had caused another uproar.
Zakku's skin was as dark as his father's, but his pale gold eyes and black hair plainly declared who his mother was. Since the royal family had a history of pale skin, there was some grumbling, but no one dared to talk about it within earshot of the Princess or her consort. After all, an heir was an heir regardless of his paternity.
"Great birthday present, isn't he?"
"Well, I definitely could've done without the pain and the screaming. So humiliating. But all things considered…" Azula planted a light kiss on her son's forehead. "I suppose he was worth it."