i've already read hybrid child and sekaiichi hatsukoi
...That's a toughy...But 'Love Neko' by Mishima Kazuhiko is in that range of top yaoi favorites.
It's...like, pure smut though. But, there is cuteness in there as well. Along with comedy.
But, c'mon! There's a neko in it! xD
Boku no Pico
Fall in love like a tyrant
(I looove this one >__<)