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I have come to bless you all with another DPXDC idea!
Demon Twins AU/Protective Big Brother Damian
I'm reading a fic on A03 (Alfred and the Attic Squatters. It's really good.) In the fic, Damian explains how Jason was sent away for almost killing him. So what if Jason actually kills Damian's younger twin brother Daniel? Damian is so full of grief because while he tried saving his twin. It wasn't enough. Jason was just too much for his five year old body.
When Talia finds out, she sends Jason away in fear he'll kill Damian next and dips Daniel (Danny) into the Lazuras pit. While Danny comes back, he's weak, and Talia knows her father would just have Danny killed off again. So she sends Danny off to be with his father. Knowing her beloved would protect their youngest son. She tells Damian that she sent Daniel off to be with their father and that Danny is safe.
Except, Danny never makes it to Bruce much less, Gotham. An accident happened with the people Talia sent to give Danny to Bruce, and none of them made it to Gotham. Instead, they left Danny on the steps of The Fenten's. Years go by, and Talia never checked if Daniel made it. Worried, it'll alert her father about Danny. Imagine her horror/surprise when she drops Damian off and asks to see Danny.
~
Both Talia and Damian stood frozen at the news. "Whose Daniel?" Bruce's face was full of confusion. "Daniel. My younger twin brother. There was an.... accident, and he was sent off to Gotham to be with you." Bruce's face quickly changed to worried horror.
"I-I never got him. He never came to me." Talia felt as if she was dumped into artic water. If Daniel never made it to Bruce, did he even make it to Gotham? Where was their baby boy? Damian had already been told of his weak state and how it'll be up to him to keep Daniel safe. But if Daniel never made it to Bruce there was no telling where he ended up. She just hopes Daniel is okay.
~
Wide glowing green eyes stared at his "parents" in disbelief. They didn't care if he was Danny. They didn't care if he was their "son." They only cared about their research and taking him apart. He struggled against the binding on the metal table. He hopes Jazz comes home soon he doesn't know how much longer he can keep them busy. He wishes his big brother was here. Damian always knew what to do in these situations. Damian always kept him safe however he could.
A loud wail like scream was released when the scalpel started cutting into his chest. The wail echoed across the realms. Eventually, the wail reached a young boy who froze mid-training. His adopted siblings turned worried when his eyes glowed, and he faced turned to one of complete rage.
(You can add to this if you want. I just want a good prompt/fic of protective big brother Damian that would do anything to get his precious baby brother back to his side)