 If you liked
Ingènuo
|
 ...then you might like
Kiss yori mo Hayaku
|
they both have a teacher and student relationship
Kiss Yori mo Hayaku: light romance, immediate progress with the sensei and the girl (they got married in the 1st chapter)
Ingenuo: dramatic, tragic at times, and the romance between the sensei and the girl takes forever to build up but its still preety good