Have you tried Takane to Hana? It has a similar set up I believe. http://www.mangago.me/read-manga/takane_to_hana/
Yup but it became a tiresome read after sometime
Understandable! I kinda felt the same when reading it, haha. What about houkago x ponytail? ://www.mangago.me/read-manga/houkago_x_ponytail/
Whoops! Sorry the hyperlink got deleted, http://www.mangago.me/read-manga/houkago_x_ponytail/
Any manga like Ojikoi? Like shoujo with a substantial age gap and the girl is strong and interesting?