How does War react to fatherhood?
At first....absolute shock. He had no idea two different species were even compatible like that, and even after the initial shock, takes some time to process. Not to say he is not good at adapting, but a revelation of possible father hood is staggering for a Nephilim who has known nothing but combat and bloodshed. Helping bring a new strange life into the world was something even he was not prepared for. Siva, tho despite also disbelieving it, is actually more welcoming to it. While it was a surprise, she is more open to the idea of being a mother even with the child's crazy heritage. After all, no matter how the child came out, it would be hers and War's to care for This openness to it helped War a bit with his stance on the matter, and despite his slight apprehension, her happiness made him more at ease with the idea. At least this his initial reaction at first.
In the first few weeks of her pregnancy, at first he would go off and think by himself. His natural response is to go about it like a strategy, consider the possibilities, think over the possible future for this child and how he would even begin to help care for it. I say help because despite his unease and uncertainty, he is not the type to just leave when things become unclear or overwhelming. He would see it through, and he knows Siva would as well, so he would not leave her in a time where she was vulnerable and carrying out the pregnancy. So after a couple of weeks of mulling it over, he goes to others like his Brothers and sister for advise since he is the youngest and the most inexperienced when it comes to this(Maybe even a select couple of humans for information and expertise on it.). After that, he goes about it as he normally would. Protect the home, make sure to get rid of any threats to them, and just doing what he has always known. Which of course stems from his unsaid fear that if he sticks around too much, he might accidentally hurt her and the child knowing his nature and lifestyle is dangerous. It takes a great deal of convincing and reassurance from mostly Siva, Strife and even Death for him to actually enter her house.
This pregnancy is new to him, but Siva is patient and compassionate to his dilemma of unfamiliarity, so she takes it slow. She starts small, asking him to help her with small things like retrieving some supplies, carrying some heavy stuff as she got further along, and even to help make a room for them. As the possibility of hurting her slightly receded as she reassured him, she got him to a point where she grabbed his intact hand and placed it over her stomach. Feeling the first heartbeat was all it took for War's worries and fears to wash away, even if for a moment. That moment he realized that he had nothing to fear from the child. That new heart beat, War would do anything to protect it, and that he felt a sense of wonder that he gave this new being life instead of taking it.
Thanks for the ask.