94 "Protect the Pure-Heart! A Three-Way Battle"

Haruka and Michiru overhear Usagi and Unazuki talk about kisses in this episode. They find the girls' conversation cute and romantic to dream of first kisses. When alone, Michiru comments that she and Haruka "don't have the luxury to be falling in love" at that time. That could of course mean finding separate people and such, but it could also indicate that the two had developed feelings for one another, but know it will get in the way of their mission. In both cases, they both must give up the chance of romance with another.