Try
~Hana no Namae
~Ten no Ryuu Chi no Sakura
~Hana to Akuma <3
~Yume Miru Taiyou (16 and 21)
~Yurusarete Inai Watashitachi
~Love so Life
~Taiyou no le
~Kore wa Koi no Hanashi
~Faster than a Kiss <3 (This one is really cute)
~Rinjin wa Chou
I hope that's enough. That's all I can think of. (●'◡'●)ﾉ
this has a unique kind of age gap http://www.mangago.zone/read-manga/hajimari_no_niina/
V.b rose is one of my favorites.
http://www.mangago.zone/read-manga/keishichou_tokuhanka_007/ is quite possibly my absolute favorite manga.
Any shoujo or josei with a big age gap relationship? something like
http://www.mangago.zone/read-manga/darenimo_ienai_maruhi_nioi/ ? Tyヾ(☆▽☆)