"Yessir. Yessir! um... " What did one say in a situation like this? Superman had patted his shoulder and said it was okay for him and Kara to date. That was... well it was a huge relief and Bart seemed to relax-- though he didn't think he'd actually stop being nervous until this was all over.
"Yes sir. I will sir. Thank you sir." Bart looked back down towards the street, then back up at Superman. "um. Can you help me down?"