This is a picture, made for Club-Sannin September contest "Back to school". I don't know why, but I saw this as a kind of field practice. There was a filler in anime, where genins where supposed to teach academy students survival skills. So I resumed that pedagogical practice was a common thing in Konoha. And this picture came to my mind at once.
That's what could happen if Sarutobi told his apprentices to give some lectures to youngest students...
The Sannin here are not older than 18.
The book Orochimaru's reading titeled "The Preservation of corpses, ch.2" (I made too small letters..)
I think that Jiraiya has skipped from azimuth calculating to something more heroical pretty soon. Looks like now he is very close to Onbaa story...
(And - yes, you may enjoy trying to identify some of future Konoha ninjas

Black ink, quill, brush.
Characters (c) M.Kishimoto
BLARGH I CAN'T IDENTIFY THEM PLEASE TELL ME WHO THE KIDDIES ARE