Next one will be a lot longer, promise. XD
Naruto is fourteen, and getting an unfortunate response to women wearing pelts. It doesn't help either that Kiba's older sister is a sexy woman, strong and confident and even sort of dangerous. And, if that isn't enough, there's no shirt underneath her Chuunin vest.
Imagining her on all fours while she lectures them on the peculiarities of the beasts Teams Seven and Eight are tracking in these barren snow fields is one of his guilty pleasures. He draws the line at imagining a bushy tail batting against his thighs, though.
'Keep your fantasies to yourself,' he mutters that night, half-asleep in his tent, hand down his pants, and vaguely hears a rumbled, blatantly insincere /don't know what you're talking about/ in response.