So this is like, a collection of short stories? I like it.
For the first one, well normally that's what would happen in Hentai, I suppose. The substitution jutsu working that way makes a lot of sense to me, I mean, where do they magically get a change of clothes otherwise?
Also that moment when the girl on your stomach gets jealous of you going out with your Kouhai...And in that last one, it implies that the teacher was licking her recorder, right?
Man, these stories were all amazingly entertaining, what a great release.
If "substitution jutsu" worked like that, chances are many currently mainstream ninja anime like that one featuring the boy in the orange track suit would either be censored for normal TV airtime, run only late at night, or be classified as Hentai.
*crickets chirping*
And that, plus the rest of this comic can be summed up in one word: ..... "DAYUM!"