Sakura's shampoo smells really nice, flowery and sweet like her name. But that scent of blood and life coming from her with each moon is a lot more intriguing. He wishes she wouldn't cover it up with perfume every time she goes and sees Sasuke at the hospital; it isn't as if helping him with his reeducation will leave her smelling anything but sweaty.
Sasuke smells like medicines and drugs; not as much as he should, though. Naruto doesn't say anything. If he was in his place, he'd spit the damn things out too. Besides Sasuke can only handle so many "for your own good" interventions from anyone, and Naruto used pretty much all his credit for the next ten years in one go. So he takes all the snapping and the things thrown at his head and the frozen silences, and he waits. Underneath the drugs and the distress and the hospital food, Sasuke still smells like Sasuke.
Sometimes, rarely, Sasuke smells a little like Sakura, but Naruto doesn't say anything, even though he wishes she would hold him, too. Sasuke needs to get used to human touch again a lot more than he does.