Train naked!

Naruto nodded along to Sarada's explanation as his idea came to him. Now to just get Sarada to agree to it. "Alright I can try that. But I think for it to work you'll need to lose your clothes." Sarada turned red as a tomato in a second and she started spluttering so he explained "That red Chakra you're talking about is really corrosive, Sakura once got side-swiped with a passing attack and couldn't heal it because it burned through her Chakra. Filtered trough me I can get most of that taken away so you don't get hurt by it, but it's still corrosive and if you don't give it something to eat at like in a fight it'll start targeting you and your clothes. It will also heal you so you'll be fine, your clothes won't be though."

He waited patiently as she continued to splutter, face calm and not a hint of the lie anywhere on his body. The truth was that while Kurama's Chakra was highly corrosive he was more then capable of getting rid of that entirely. The only reason for this lie was to see Sarada's body without restrictions.

She was finally able to shyly say "I don't know, that seems awfully embarrassing." she was biting her lip adorably and looking around, face still red.