Naruto! Don't Have Children!

Growing up in two different worlds wasn't so bad. Sure people would look at him like he's mad if he told them about Konoha but that was understandable. Hell, he even had a cute childhood friend living next door. Life couldn't get better. And then some guy from the future shows up and tell him humanity will die if he doesn't marry his childhood friend. Shit. Probably a harem story.