Kakashi was deeply confused. Naruto kept on fussing and nudging his breast. I mean, he knew that babies drink breast milk but he wasn't even sure if he could produce any.
Naruto whined once more and Kakashi sighed, incoherently. Oh, great, He was mute in this universe as well. He pushed the irritating though to the back of his head and pulled up his shirt with one hand since he was cradling Naruto with the other. He showed his pink, inverted nipple off, embarrassed.
Naruto "glomped" it as soon as he saw it and sucked the warm white milk from it forcefully. Cute little suction sounds were pressed up against Kakashi's soft, porcelain chest, though, they weren't as cute to Kakashi.
It felt like a hornet was buzzing against him!
The small, warm mouth devoured the nipple, chewing it with non-existent teeth.
Kakashi blushed. No one since Obi-
POP!
Naruto released with a soft POP! sound.
Now, he would have to repeat this every hour or so or something like that.