The mag is called "I want to be your teacher", and uh, based on the, uh, real life thing it is a parody of, I'm pretty sure it's not specifically an imouto porn but more of a teacher/tutor thing
I didn't expect a (pretty damn adorable) pout from her for that, but I guess that's because it was a Sensei x High School Girl H-manga... not exactly the smug inducing imouto H-manga she expected.
On a side note, I like that the H-manga she's holding has "芝野七(?)" (Shibano Nana(?)) as the author.
Shibano Nanao, I see what you did there.