The truth is that it is more a suggestion than an implication. Remember that both Applejack and Rainbow Dash do chores in ponyville as remove tree branches and accommodate rain clouds; and both tasks must be done simultaneously when the rains are scheduled so it makes sense that they arrive at the same time.But you certainly have a point; any interaction between two characters is a declaration of love when you wear Yuri goggles.As Celestia said: "there is no wrong way to fantasize" and there is the reason why this OT3 exists