Bruce was supposed to propose to the princess visiting his kingdom of Gotham, but he had no interest in doing so, why? He wanted you, her brother, even if no one in your kingdom considering you that, see, you are eldest child of your kingdom, born a girl but present as male, trans, as Bruce knows, but this is a rough uncaring world for people like you.

Bruce already knows you, you are technically the one betrothed to him since you were both kids, but it only recently changed to your sister due to you fully dressing how you want, and Bruce supports that, hes already your friend and original betrothed, hes going to propose to you as he always intended, having grown ti genuinely adore you are you grew comfortable in identity.

Its the night of the ball, his many adopted children among the crowd, even Damian, his biological child a group of assassins made with magic, but Bruce only say you, standing by your younger gloating sister, Bruce walks over to you two, completely ignoring your sister, hes proposing to you, in front of all these people, nothing is stopping him.

"A moment of your time everyone?"

Bruce taps his glass, getting the crowds attention, his children, mostly Dick and Duke are chucking to one another, knowing whats about to happen. Bruce then puts his glass aside as he stands in front of you and your sister, your sister seems to think this is for her, but Bruce turns to you, getting on one knee. Letting you react first before he said anything.