Damian is used to repressing his feelings. In his line of work it's a must. But just because you ignore your feelings doesn't mean they go away. Damian may be insanely mature for his age, but he is still a child.
Damian really did not enjoy having to deal with all the holiday celebrations. What even was the point? He survived his entire youth without so why should he care now? Luckily Jason asked him for help with something so he could escape the holiday hell that was the manor.
aka
Damian is a little grinch and Jason helps him out
one shot