This and the following chapters contain side stories set in the universe of Unite Heaven and Earth. Not in any chronological order. Many of them are just alternate timelines or possible interesting occurrences. Don't take them too seriously.
Sasuke handles the problem himself.
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Naruto and Jiraiya find a sleeping adult Sasuke in Water Country while traveling. Naruto runs up to him and starts shaking him.
"Teme! TEME! Wake up!" yells Naruto.
"Dobe... Be quiet. Give me a soldier pill." Sasuke grumbles. Naruto reaches into his bag and gives him one.
"Why the hell do you look so old-ttebayo? What did Orochimaru do to you!?"
"Don't worry about that. Listen. You need to tell Sakura how you feel so the two of you can get married. Don't make me marry her; I do not have the time for her, understand?"
"Uh, ok? I want to, but you know she's in love with y-"
"I don't want to hear it!" interrupts Sasuke. "That attitude is what put me in this situation to begin with, you idiot. Fine! Don't marry her. But whatever you do, don't have any children with that stuttering Hyuga stalker. It will be disastrous and fatal for you. I repeat: Fatal."
"Why? I don't understand how that could kill me..."
"There's no time to explain. Any second now, I'm going to disapp-"
Sasuke starts to shimmer and vanishes.
"Well, that was interesting." quips Jiraiya.
"Sure was..." Naruto mumbles.
"Do you think he came from the future? Doesn't that mean you're going to become a failure in love like me?"
"I hope not..."