User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-4547267-20140701154719/@comment-16281343-20140702164150

Why would they think of that kind of stuff if they were at war with each other?

Like FTGM said, that plan started after the Alliance and it's originally created for Irina's sake.

"With the help of Michael, he was thinking of a way that allows Irina to make babies with Ise. So they created a special room where Angel can have sex with a Devil."

- Volume 18 Life 1