Do you have a head-canon for how Damian and Jason would get together in a non-ABO 'verse? *is curious*
Jason was Damian's sexual awakening. He was thirteen at the time, and for the longest time, Damian was Jason sexual. He watched Jason uphold all the virtues his father and grandfather claim as their mission statement, all the while never losing his humanity or kindness, like his father and grandfather did.
It's inevitable that Damian would fall for him. At first, it was a silly crush. Something he knew he just had to wait out. He'll get over it when his heart catches up to his superior brain he tells himself. These are just teenage hormones floating about in his body and messing his body chemistry.
But then he finds out why Jason inspires such loyalty in those who really know him.
Damian has seen Jason put down a child trafficker with extreme prejudice one minute and the next minute, he's gently comforting the victims. He sees how much Jason cares for the people he's fighting to save and how hard to he works to make sure they know they're safe and will never be victimized again.
For Damian, Jason is the ideal. He has hobbies that other guys would consider a threat to their masculinity, but Jason doesn't care. Damian wants to be like Jason. He wants to be able to cry when he's sad, do what he enjoys and not always be the strong one in his friend group all the time, without being judged for it.
So when Damian realized this crush has grown into something fierce, there was only one thing to do. He is a Wayne and an al Ghul. They always got what they want.
Damian pulled out all the stops - short of confessing - to communicate how he feels to Jason. From gifts he knows Jason would appreciate (like books and weapons) to having running missions together. Sometimes, the missions took them out of Gotham.
But even if Jason wasn't the most oblivious man in the universe, Damian is still a child and he would never see the brat as anything more. So when Damian suddenly decided he wanted support street art/performances with him, Jason thought it was because the brat was bored. At least he didn't criticize it much, and what criticism he did have was usually helpful.
When the brat started asking for his assistance more on missions, Jason went because despite his obvious skills, someone had to keep an eye on the brat. The kid was good company when he's not being a prickly little shit.
After months of getting nowhere, Damian gives up. Damian may be mature for his age but Jason is never going to see him as anything other than a kid. It hurts, but he understands that it's part of what makes Jason who he is. He would be a hypocrite if he killed pedophiles, while dating someone underage.
In the following years, they maintain a good relationship. Even when Damian had to leave Gotham and return to the League at the age of seventeen. Ra's al Ghul has gone unchecked for too long, the League is in disarray and Talia wants no part of the it. She refuses to be sucked back in.
His father did not agree with his decision to return. Dick understood why he was doing it, but he didn't approve of Damian's decision. He was worried Damian would fall into the same pitfall that Ra's fell into. After all, absolute power corrupts absolutely. They didn't want to have to meet the new Demon's Head on the field as an enemy. Jason made sure he knew what taking the position of the Demon's Head would entail, and that he was ready for it. He has no room. To judge anyone for choosing their path in life, but he needs to make sure Damian knew what he was getting into.
They didn't keep in touch for the next few years after Damian left Gotham. Steering the League back to the purpose they were created was a full time job for the new Demon Head, and the Red Hood is always busy, operating on a global scale now.
It's not until five years later, when Damian is twenty two and Jason is twenty eight that they see each other again. A threat arises that forces the Red Hood and the League to join forces.
Damian thought he had gotten over his first love. He's not prepared for the onslaught of emotions that attacked him at the sight of Jason.
This time, however, they're on equal standing. Both grown men and badasses in their own right. No way Damian will lose Jason again.



















