[I hadn't really wanted to write a villain who acted like an idiot, so I made Setsuna a little more repulsive instead.
If you don't like him, I'll reduce Setsuna's screen time or just revise his characterization.]
Obito continued.
"The Ten-Tails is the source of this world's chakra, and a monstrous beast that will bring the world to its end."
"Anyone who masters the Ten-Tails' power can rival the legendary Sage of Six Paths."
Kakashi touched his forehead protector, his expression grave.
"I won't ask how you found out about all this... Do you have a way to stop them?"
Obito nodded.
"That brings us to the question of how to summon the Ten-Tails..."
(You all know I don't pad the word count.)
After they talked for a while, Obito spoke solemnly.
"I'll be leaving the village for a while. Help me look after Grandmother and Rin."
Granted, he had Kamui, the ultimate tool for a long-distance relationship.
But once he really got busy, he might not have time to return to Konoha often.
Hmm...
Maybe I could come back every so often and secretly leave a Shadow Clone behind?
Kakashi frowned slightly and asked,
"What are you planning to do?"
Obito spread his hands.
"Staying in Konoha ties my hands. It's hard to go all out against these guys."
"Now that they've exposed me, I might as well step into the ring and play along."
Kakashi sighed.
He took a kunai from inside his clothes and handed it to Obito.
"I won't try to talk you out of it. Be careful out there, and..."
Kakashi cautioned him earnestly.
"Don't take things too far."
Grinning, Obito accepted the kunai and tucked it inside his clothes.
"Don't worry. I always know where to draw the line. I never do anything reckless."