Shimazaki Nana@Oshigoto Boshuuchuu - Vol. 5 Ch. 25

[MangaDex]

 

[JaceG13]

So  that's how lucky pervert scenes occur so often in manga, it's because of a passing pervert.

 

[mojo72400]

Smart move by Tsuyu in creating a lucky pervert scenario involving her imouto.