I have no idea what my first f/f fic was, but it definitely would've been a Sailor Moon fic. This was before any canon about Haruka and Michiru was available in English, so it was probably Rei/Usagi or some Inner Senshi pairing.
A few specific plots I remember from those days: --Rei and Makoto (I think?) discover they've each been writing about their secret feelings for the other --Michiru takes Haruka home to meet her family as a "friend", only to have their real relationship found out by her obnoxious-but-ultimately-supportive brother --Princess Rei has angsty sex with a nervous Princess Serenity right before the latter's wedding
And plenty of ensemble fics where Haruka/Michiru was a taken-for-granted part of the team dynamic. (The team-babysitting one where 3-year-old Chibi-Usa walks in on the couple, and a frantic Minako has to try and give her The Talk, was priceless.)
Re: You Never Forget Your First Femslash Fic
A few specific plots I remember from those days:
--Rei and Makoto (I think?) discover they've each been writing about their secret feelings for the other
--Michiru takes Haruka home to meet her family as a "friend", only to have their real relationship found out by her obnoxious-but-ultimately-supportive brother
--Princess Rei has angsty sex with a nervous Princess Serenity right before the latter's wedding
And plenty of ensemble fics where Haruka/Michiru was a taken-for-granted part of the team dynamic. (The team-babysitting one where 3-year-old Chibi-Usa walks in on the couple, and a frantic Minako has to try and give her The Talk, was priceless.)