The art looks like knockoff Morinaga Milk.
Eh? I can see that Mira draws somewhat like Morinaga, but I wouldn't call it a knockoff. I mean, Miras' art has enough uniquenses to distinguish it from... well, any other artist. (Atleast that's what I think.) Maybe it's just the "dark-haired meganeko + blonde" duo that just screams Morinaga that makes them seem more similar than they usually are?
I'm a die hard Girl Friends fan and I can't see any resemblance from any of Morinaga Milk's art here.
@_@
The story's cliche but art's good.
It's quite common with porn, though I still don't get the always-empty-classroom-for-sex scenario. I mean, do students always get left behind in Japan and all school staffs go home?
I only experience those empty classrooms with almost none personnel around in college.