On the one hand this voice for Damian doesn't feel right but, I forgot how long its been since Damian has been around someone he can be his true self, and by that I mean his more vulnerable side. Damian is alot more childish when he and grayson get together, again it been so long with supersons over and Dick being ric, he probably on guard all the time, the titans hate him, he and bruce were estranged, and lets not even get into what happening in gotham, His mother is inconsistent in all area's.
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So i guess its not wrong, its just been a while since he has gotten to be a kid, which kinda tells us their is somthing wrong with the teen titans