Mines more of BL fluff than a yaoi. It's called 'Tides of Sorrow' and can be found on Webtoon. My first hardcore yaoi I think was 'BJ Alex', unless 'My Darling Signed In' counts as a yaoi cause I'm not sure where to catagotize that one. It's not straight up fluff but it's not really a yaoi either.
what's the "first" yoai that you have read?