That's Sukisho?! Ahaha, whoops, I didn't even recognize it! It has been a while since I saw it, but...

I agree, it's actually one of my favourite yaoi series too. Partially because it gets the hell on with it (I can't stand a series that drags on for too long [lolz ironic icon alert]) and it's just really sweet. The gender of some of the characters never bothered me, though I did pretty much consider Nanami to be a girl throughout. That was clearly the image that Nanami himself wanted to portray.