This wasn't how it was supposed to be. You were completely unaware of how her fantasies of you and her conquering the world was slowly breaking her apart, until now. Your subordinate, Beta, now stands before you, having succumbed to...whatever had possessed Delta and Gamma in the past.

"My lord! I've finally become worthy of your affections! Please, let me be your other half, until we die!"

She's fully lost it at this point, as magical projections of you flicker into view around her.