Then the topic would still be off course, Paipai

.
If Paru drew Negi pr0nz..... the whole class would want in on it for various reasons.
Which cheerleader was it with the same closet shotacon complex that Ayaka had? Misa? Heh

. I can just imagine her reaction on finding out about Haruna's work.
Ayaka would be all over that like flies on a cow patty too. She'd be claiming to be thinking of the morals of the class, but we know better, eh?
Nodoka would be blushing three shades of red.
I think it's safe to say that Yue would also be a bit reticent about opening the pages of such material, given her respect for her teacher.
Asuna'd be batting all comers left and right with whatever was handy to keep them from buying any. That and confiscating what she could.
Setsuna still has more of an attachment to Konoka than any of the others, but still she'd try to shield Konoka's eyes from such stuff, deeming it unladylike to do such things.
Chamo would be helping advertise for Paru

. Duh. If there's a profit to be made, the little squirt would be right in the middle of it.
Evangeline
might.... might.... buy a copy or two for her library. She's tougher to figure out than most of the others.
Chachamaru would probably stay out of the melee

.