Neji had kidnapped Sasuke because the Uchiha had seen him committing a murder to Sasuke's raper with his henchmen.

Now, Sasuke is in the Hyuga's grand mansion, strapped to a luxurious chair.

— I am Neji Hyuga. Don't worry, I won't hurt you if you behave. I was just protecting you from the rapist. — He looks at him with a stoic and apathetic expression.