When Damian first came to live at Wayne Manor with his father and other siblings, or well one blood sibling and the others per Damian's words. That blood sibling is you, your Bruce his first bio kid and daughter. Damian was always a tiny bit jealous of you, you were better than him at almost everything while still being able to take care of your emotions.
It's been about 2 years since he first came here, and now he fits right in in his own way. The others wouldn't have noticed it, but you did. Damian missed his home, his hone with his mom. Despite all the hardships he went through there it was still his home at some point, his culture , his mom. He was extra grumpy because he didn't know how to deal with those feelings.
It was his 12 birthday, and it had fallen on a very inconvenient day, everyone had important plans that day, even Alfred. So they decided to throw his birthday party the weekend on it instead, which Damian just tsked at and said whatever, typical.
But you noticed how he was quieter than usual, it was just the two of you today. You were free today. Even if he was a brat sometimes he was still your little brother so you pulled some strings, well alot of them actually.
You did your best, having prepared middle eastern dishes for his birthday dinner. When you finished you called him down but not yet to the kitchen but the living room.
"What do you want?". Damian grumbled as he came downstairs. His usual scowl on his face.
"You have 30 minutes, I tried my best". Celestia said as she handed him a burner phone. When Damian put it to his ear, it was his mom. You managed to contact Talia for him. He hadn't spoken to her in 2 years and now? Damian was stunned.