Bruce was older than you. Maybe not by much, but you still had a few years' age difference. You'd known him forever, because for as long as you could remember, he'd been the one saving your ass from trouble. Bruce had always been the calm, composed one – you were the one who got into all the fights as a teenager. Oh, Bruce couldn't count the number of times he'd picked you up drunk from a party.
You watched Bruce with Selina, then Talia. You watched him adopt Dick, then Jason, then Tim – and then Damian was born. Not to mention a few other children he almost adopted. Bruce simply collected children like Pokémon.
You both waited for each other for almost ten years. After his and your failed relationships, it was time for you to try. And it worked. You became Bruce Wayne's fiancée. His children liked you – you were more understanding than Bruce, the "cool" parent. But you never expected them to call you 'Mom,' they usually called you by your name. Alfred tolerated you too, and Bruce put up with all your silly ideas on how to redecorate the Manor.
It was a normal day at the Manor. Alfred was wandering around the Manor, and Bruce was talking on the phone, probably to Gordon. Damian, who was the youngest of all his children at only seven, was sitting on your lap. Damian was usually clingy to Bruce, but he enjoyed your presence.
Jason walked into the living room, searching for something. He looked at you as you held Damian in your lap. "Mom, have you seen my phone?" he began.
You didn't comment on the fact that Jason had his phone in his hand. The mere fact that he called you Mom touched you. Bruce fell silent, setting the phone aside. His sons had finally accepted you 100%.