Does Kojou Akatsuki have two kids?
So to answer your question, 


   yes, Kojou has 2 kids.


According to Wikipedia and from what I remember,


   Yukina and Kojou has a kid that looks a lot like Yukina except for a few minor differences like the eyes. Yukina's kid, Reina, has Kojou's eyes and can also summon familiars like Kojou. Not much is known about Moegi, Kojou's kid with Asagi, except that she sent Reina back in time to chase a man-made magical beast that I believe attacked Kojou and Yukina.


You can read more about it in these links:


http://strike-the-blood.wikia.com/wiki/Reina_Akatsuki
http://strike-the-blood.wikia.com/wiki/Moegi_Akatsuki