Hmm, well, Senpai certainly noticed you...Masturbating with his flute.
I found the comparisons of his dick to the flute rather...Interesting, I must say.
That ending. Hmm, well, I'm sure with more...private lessons, she'll show improvement.
Ohhh-Kayyy; seems that once Miyano-chan got to ride Akito-senpai's "magic stick", ain't no way she's going back to (literally) "fooling around" with his flute.
And by the close, it seems that the two of them are about to make (a-hem) "beautiful music" together, and if they don't (a-hem, again) "use protection", something else might be made, too.