Help with finding chyoo story

Looking for story where government decide to put a breeding program in a high school and guys can get to fuck the females they want buy filling out list as they match and try to have kids revolves around main guy who get to do that and he also fucks his sister

I am struggling to find the story so whoever find it please put the URL to the story in response to this thread I know it is a older story

"A World that was at War"