 If you liked
Empty Heart: Itsuwari no Koi Dakara
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 ...then you might like
Kusatta Kyoushi no Houteishiki
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Both series contain a character who starts out in love with someone, but ultimately ends up falling for that someone's younger brother. They also both take place in high school, where the main pairing is a student and a teacher. Kusatta Kyoushi no Houteishiki is longer, and more oriented towards the emotional aspect of the relationship--there is little physical intimacy between the main pairing until the last two of ten volumes; Empty Heart, on the other hand, has the main pairing jumping straight into the "physical" and only sorting out the "emotional" at the end of the story.