I AM EMOTIONAL RIGHT THERE ALONG WITH HIM, Damian’s plan to throw them off is by faking Jason out by pretending to play on his anger issues, but in reality understanding Jason’s real weakness: How vulnerable he is to his emotions about his family, especially kids like Damian.
Damian goes in for the hug and Jason hugs him back and, given the way the rest of this scene plays out, I don’t think Damian is faking this, I think he genuinely cares about and loves Jason, that the hug was real in its own way, at the same time as being a plot to throw Jason off his game.
Anyway, I’m emotional about Jason’s love for his family and how fragile his covering up those feelings is, and that Damian sees right through him, of course Jason would hug a kid back who threw their arms around him.