The infamous Demon Lord died saving the world, then unexpectedly received a choose-your-own System and a chance to live another life with an identity of his choosing.
After a lifetime of fighting, he died without leaving behind a single child, so he decisively chose the “more children, more blessings” System.
The System had paired correctly, and the identity fit his requirements, but... was the gender just a tiny bit off?
System, version one: Having a baby is out of the question, and I’m not dating anyone either. I’ll just coast through life and do nothing.
System, version two: Having a baby won’t work, but holding hands doesn’t seem like it would hurt, right?
System, version three: We’ve already held hands. Maybe a little kiss wouldn’t be so bad... You can’t get pregnant from one kiss, right?
Final version of the System: Two children in three years? What do you take me for, the Demon Lord? One child at most. Take it or leave it!
