Ikr.
It's kind of, If you understand whats the girl says, you'll be like:
"This is so awkward, I don't want to have an imouto anymore."
Normal answer.
But, If you're an otaku:
"Come to your Oniichan."
Ummmm pretty sure a 5 year old mother has a 1% chance of happening because she isnt old enough to be going through pruberty wich means she never had her period wich also means she isnt ready to mate yet because she is not matured enough yet wich brings us to the conclusion that she can not get pregnate and have a child BUT she can still have sex even though that would be rape (in america as far as i know) because she isnt sixteen or eight teen years old and cannot consent to sex. O_O wow this is a mouth full (no pun intended).
Yea i know about the story i read the article and what it means by not old enough to consent to sex means rape weather or not the under aged female was ok with it, if she is not of age to consent to sex then it is rape lol