Both

Annette had an idea of how to fix this.

All women at Garreg Mach with busts bigger than Annette and smaller than Manuela's must be topless at all times, except during training sessions.

Then...

Edelgard von Hresvelg is secretly obsessed with Annette, to the point where her pussy gets wet at the mere sight of Annette. She wants Annette to find her sexy and will do anything to get Annette to be her friend.