I recently had am unsigned, anonymous review that complained about Mako being the father, and said I should go back and edit the story to change it.
They even suggested Korra using some funky Avatar power or visit the Spirit World to find fertility spirit so she could be the father.
Well, that's been done more than once; I even hung a lampshade on it back in Chapter 7, and I felt like taking a different direction.
If you want to read a good Korra is the 'father' of Asami's child/they adopt stories, I'm sure you can find them if you just look.
There are even some on my Favourite Stories list.

Talking, Not Doing

Asami sat, fuming.

Once word had gotten around about the ongoing attack on the Southern Air Temple, it hadn't taken long to assemble what could only be described as a small army to rush to its aid. Tenzin had been in charge, channelling the grief he felt over the death of his mother into anger over an attack on his nation. It went without saying that Bumi and Kya were with him, as were Jinora and Kai. Toph and Lin had stepped forward, making it very clear that they were going to express some extrema displeasure at anyone who thought they could threaten their family and get away with it. Tonraq, Zuko and Iroh had stepped forward to offer their support, and much to everyone's surprise, Azula had followed them, stating that she looked forward to a chance to 'really let rip after so long'. There had been a few worried looks, but no one could deny her power and skill as a master firebender, even at her age. No one had been surprised when Korra had stepped forward, even if Asami had expressed some concern given the fact that she had given birth just a week earlier. But the Avatar was ardent that she was going, insisting that she was more than up to the task of scaring off some opportunistic bandits who'd most likely run at the first sign of reinforcements. Asami had agreed, but had been shocked when Korra told her that she was to stay behind. For a few seconds it looked like there was going to be an Incident, but Korra calmly pointed out that Asami had agreed that one of them had to stay out of danger as much as they could for the sake of their children.

Asami had glared at her wife, but reluctantly agreed with her, and could do little but watch as they rescue party departed on Oogi, Lefty and Druk, the three creatures far faster than even the prototype airship Asami and Korra had brought from Republic City over a relatively short distance. Tonraq sent word for troops from the nearest Southern Water Tribe outpost to the besieged Air Temple to make their best speed to the battle, Fire Lord Ursa likewise sending order to one of the Fire Nation islands. But even with the fastest airships in either fleet, they would not reach the Air Temple before the party from the South Pole. Asami had stood, looking into the sky long after they had vanished from sight, until finally Senna had come and brought her in, less she catch a cold.

"It's never easy, seeing those you love go off to battle." Her mother-in-law sat next to her, "I have to keep reminding myself that they're more than capable of looking after themselves."

"I guess it's something I'm going to have to get use to; I understand why, but that doesn't mean I have to like it." Asami grumbled, "Before, when Korra was off implementing the Peace Treaty in the Earth Kingdom, I'd not long had the girls, so it was easy for me to accept that I couldn't be there with her. But now Korra's the one who's just had a kid, and I'm still the one left holding the baby. Well..." She looked over to the crib where Aang was sleeping, Ty Lee rocking him gently, "figuratively speaking, anyway."

"Spirits know I'd feel better if you were out there, watching her back." Senna admitted, "But then I'd only be worried about losing both of you."

"I don't think it's easy on them, either." Ty Lee added, not taking her eyes off of the sleeping baby, "When Azula and I first got together officially, I was still serving in the Kyoshi Warriors, and there were times when I'd have to go off on an assignment and leave her home. She's... not as strong as she likes to pretend; she has a genuine fear of being left alone by those she loves. I think that's why she was so intent on us having Azulon. I think to her, a baby would be someone who would never leave her."

There was a moment of silence as Asami and Senna looked at the other woman; Korra had told them what General Iroh had said about his family and the mystery surrounding his cousins birth. It was clear by looking at Azulon that he was related to the Royal Family, given his golden eyes that were a strong family trait almost unheard of elsewhere. But that still left the Elephant Rhino in the room when it came to the fact that he had supposedly been 'fathered' by Azula, while the fact that he had been carried by Ty Lee was a matter of public record. For a while, Asami had assumed that Ty Lee had had an affair, but then realised that it was unlikely anyone in their right mind would risk invoking Azula's anger by sleeping with her wife, regardless of how beautiful she was. She had considered the possibility that Ty Lee had been taken advantage of and covered it up out of shame, but reading the books she had written and training with a former Kyoshi Warrior made it clear that there were very few people who'd be able to make someone as skilled in hand-to-hand combat as Ty Lee do anything she didn't want to. That left Asami somewhat stumped, unable to work out just how two women could produce a baby without going through something similar to how she and Korra had gotten pregnant.

There were no doubt stories and gossip in the Fire Nation to explain it, but Asami felt sure that a lot of that would come from people who didn't really know Azula and Ty Lee as a couple. It was clear to her, simply from the little she had seen of them together, that their love for each other was as strong as her love for Korra, and that people underestimated Ty Lee's intelligence. Even in the history books Asami had read at school, the former circus acrobat had been portrayed as... simple; an air-head who had been easily lead astray by the far more dominant Azula. But having actually spoken to her face-to-face, it was clear to Asami that there was a very sharp mind behind those light-brown eyes. People often mistook a simple, somewhat carefree outlook on life as a sign of limited intelligence, but Asami had known Bolin long enough to know that that wasn't the case all the time. Her earthbending friend was surprisingly intelligent and an amazing administrator, who just happened to be somewhat socially inept and kind-hearted. But people often took that kind-heartedness as a sign of weakness, never realising just how formidable Bolin could be when he decided to stand his ground.

"I'm surprised you didn't go with them." Asami decided it was time to break the silence, "I'm sure you could handle a few bandits."

"A few years after Azulon was born, Zuko appointed her governor of one of the outlying provinces. The area had been a constant source of trouble for years, with rampant corruption and mismanagement." Ty Lee continued to rock the crib, not taking her eyes off of its occupant, "Despite what you might think of her, Azula has never been anything but completely devoted to the Fire Nation and its people, and she actually relished the chance to get out from the capital and make our land better. Well, some of the local bandits got word of our impending arrival and decided that they'd send a message, loud and clear, as to who was in charge. We were travailing by coach; the strong winds around the local mountains making travel by air somewhat hazardous, and they ambushed our caravan as we passed through a forested valley. I don't think they really understood just who they were dealing with; Suki had sent some of the Kyoshi Warriors to escort us as a thank you for my years of service, and well, Azula is Azula."

"I had trained the Warriors well, and they took out most of the bandits in short order, but their leader was a former Captain in the Fire Nation Army, and a powerful firebender in his own right. He... tried to get to Azulon, probably thinking that we'd surrender. But to get to him, he would have to go through me." A dark shadow seemed to come over the woman's face as her eyes turned downcast, "I would not move, even as the bandit sent a wall of flame strait at me. I thought I was going to die, but I was willing to do that to protect my son. So I closed my eyes and waited for the flame to strike me. Only it didn't; Azula threw herself between us, blocking his attack with one of her own. The heat was... like nothing I'd ever felt before. I could feel it washing over my like a wave, singeing my hair and cloths. But Azula stood her ground, defeated the bandit and we marched into the provincial capital with him as our prisoner."

"I realised that day that Azula would do anything to protect me, even if it meant placing herself in danger." Ty Lee turned to look Asami in the eye, "So yes; I wanted nothing more than to go and fight at my wife's side, to protect her, just as you would yours. But like you, I realise that sometimes, the only way to protect the ones we love is to give them one less thing to distract them when they need it least."

To Be Continued...
(the next chapter will cover events at the Southern Air Temple)