Rolls eyes... you guys must not have too good a memory to forget stories like those..
The Hotaru one, or one of them, was likely 'Awkward Consequences' by PsyckoSama. Two versions exist, a longer one off his defunct website, and shorter one on FanFiction.NET
The Usagi one, or one of them, was likely 'My Favourite Mistake' by Yasuhei. If it was not the one by Yasuhei... there actually was another one called 'Bonds' by spargos where it happened and Setsuna was pissed as she had slowly been trying to make the moves on a older Ranma to have a long term boyfriend.