Teenage boys experience embarrassing erections at the most inappropriate times. The Young Justice boys are no exception. Run with it anon. Run your pervy or not so pervy little heart out. Extra love for writer anon if one time is during training with Black Canary.

Batman gets heartily, heartily sick of Superman's attitude towards Superboy and decides to take drastic action - he takes the kid under his own wing and helps to train him alongside with Robin. Superboy ends up being part of the 'Batfamiy', with Robin sometimes calling him 'Bro' during YJ missions. And then when Superman finally gets his head out of his ass and comes to try to teach Superboy, he has to first pass the Batfamily's tests to see if he is worthy of Superboy. Because Bats take care of their own.