 If you liked
Dear Green: Hitomi no Ounowa
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 ...then you might like
Kyuuso wa Cheese no Yume wo Miru
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Both are very realistic, Josei-ish, and with extremely well-developed plots. Unlike so much of the yaoi out there, these aren't purely about smut between two cliched characters. Both have lots of drama, feelings, and complex relationships involved. Nothing is rushed, and it doesn't end after they get together. Also, there isn't that annoyingly obvious distinction between the seme and the uke. If you liked one, you'll definitively like the other.