
My first yaoi was Sekaiichi Hatsukoi and my first shounen ai was Loveless

My first was Dog Style.

Now here's someone VERY similar to me!! My 1st yaoi was a Exclusive love contract by Minami Haruka. However at that time i was highly allergic to yaoi (imagine my trauma). After that i was very careful about checking out genres before picking up mangas. Around 1 years later, i read Legal drug, watched Junjou and my world changed :)

Nice! Minami Haruka inducted us both into the world of yaoi not so favorably. Ironically, I did read some other works of hers (like the pervert I was) once I got into yaoi with Junjou and I think Koisuru Bouken. But yeah that was when I was purely into shoujo. (I remember thinking that the uke from Love kitchen was a girl. Then I saw his dick.)
Name of your 1st yaoi/shounen ai manga?