I was actually revisiting some manga/anime I have read/watched in the past and a few came up that I thought were really good. Kodomo no Jikan and Miman Renai. Yes in KnJ they have perverseness but some moments, particularly back stories, rival Clannad in my opinion.
I was looking at some of the comments on the manga's page and comments online and I began wondering why is it that these manga's are bashed as wrong yet, a lot (and I mean a lot) of shoujo have teachers as love interests and nothing bad is said about them? Please, don't think I mean to bash shoujo manga. In fact some of my favorites include Usagi Drop and Dengeki Daisy.
I don't know maybe it's cause the girls are so much younger then the guys but whenever I think of my friends in rl and think of their age difference it makes me think when they graduated college there spouse was 2 years old.. So why do the manga's get bashed? How is the character's feelings in Kodomo no Jikan different from Usagi Drop?
Spoiler (mouse over to view)
both girls are in almost the same situation with a vastly older man is caring for a very young girl and even end up with them in the end all the while the guy doesn't expressly go after the girl romantically.
The Answer? There is no difference. If you want to play the perverseness card there are plenty of smut shoujo out there as well as Yaoi.
[/Rant]