I''s, Sense. Recommendations
As I read Sense, with one hand on my mouse and the other at the ready on my pet snake (Wormy, FYI), something occurred to me: I'd seen the panty-detail and arses somewhere before. The heroine also reminded me of a character from elsewhere. But I couldn't put my finger on it... until I checked out Haruki's MAL page, read that he/she'd once drawn doujins of Katsura's work and it all fell into place: Haruki has a MAJOR hard/wet(?)-on for Iori, and other girls in Katsura's manga that look like her.
In Sense, Iori returns from I''s; once again playing the role of a school girl