Hello! Can you recommend me a series in yaoi/shounen-ai that the male was dressed up as a female and the other partner thought that he was a woman. I'll be waiting! >_<

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Okane Ga Nai flashback school festival
A Night of a Thousand Dreams very begining when he disguised as his sister.
Kiss me Princess very, very classic.

http://www.mangaupdates.com/series.html?category=Crossdressing&genre=Shounen%2BAi&perpage=50

I'm familiar with the first one but I only watched the ova. As for the second one, I'm currently reading it! Last, I'm done with it. 🙂

Thanks for the suggestion(s)!

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Try this one: Bijo, Tokidoki Yajuu.
Very funny ! :3

Edit :

Also

Chapter 1 from Goshujinsama ni Kiwotsukete
Kasougenjitsu Ren'airon

Maybe Ai no Shintairiku...but just maybe...>.>