 If you liked
Gravitation
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 ...then you might like
Kusatta Kyoushi no Houteishiki
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Obviously both are shonen ai but they have the same style of comedy, the main characters are persistent to gain the heart of their beloved one and both have a childish personality, I think Kusatta Kyoushi no Houteishiki is a little more serious in the last volumes because they grew up (keeping the comedy, of course), but I completely sure if you like one, you'll like the other. And they are about 10 volumes.