I don't have an all time fav since I like too many of them for different reasons, but I'll try to keep it short lol:
1. Honto Yajuu
2. Heart no Kakurega
3. Rutta To Kodama
4. Doushitemo Furetakunai
5. Kuroneko Kareshi no Asobikata
so many~! but my first love goes to: Junjou Romantica
2. Sekaiichi Hatsukoi
3. You're my Loveprize in ViewFinder
4. Ai no Kusabi
5. Saezuru Tori wa Habatakanai (with the prequel and side story.)
the summit
under grand hotel
Every yaoi there is.
1.Viewfinder 2.Hana no mizo Shiru 3.Sekaiichi Hatsukoi 4.Mujihi na otoko
Confession (Naono Bohra)
what is ur favorite all time yaoi manga...