 If you liked
Sekai de Ichiban Oppai ga Suki!
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 ...then you might like
Kitanai Kimi ga Ichiban Kawaii
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This is a manga about the love story of a girl, you can call it Lesbian or Yuri, It's up to you as long as you don't call this yaoi. It has in common that the genres are very similar, nudity scenes are everywhere, and also it's still school themed. I highly recommend Sekai de Ichiban Oppai ga Daisuki to satisfy your lust.