"Maniac." Bart finished for Wally, though he'd taken to looking at his big brother cousin with hope on his face. Wally wasn't sending him away, or making him register-- actually, Bart would have registered if Wally said it was a good idea. He was kind of relieved that Wally didn't want him to register, but he was more relieved that he wasn't going to have to... well- move in with Jay or... or whatever other crazy idea he had in his head. Of course Wally wouldn't care, what had he been freaking himself out about this whole time?
"Yeah." He said, looking away again, but only briefly. People thought he was horrible at keeping secrets- like identities and such- and yeah, maybe that was true; but if so, it was only because the amount of secrets that he kept on a day-to-day basis were filling up all of his 'secret keeping' capacity and to add more to the pile would just be overload.
"I can tell you what Grandma Iris told you- that there's someone in my time who is out to get me, and that she thinks it's safer here until I learn enough to go back and fix things.
"I can tell you that my mom..." Bart missed her a lot and it showed on his face, "My mom is still there fighting this Bad Guy; and Grandma Iris likes her so that's gotta be a good sign, right?" In fact, he'd accidentally overhead Iris telling Meloni that she was an Allen now- and that they were going to look after her (and Bart) because they were family.
"My dad is..." Bart stopped and closed his eyes tight. It may have looked like he was overcome with emotion (and maybe that was part of it) but he was also trying to pick his words very very carefully, "My dad is dead and Aunt Dawn and her family couldn't take me in either." He left off the part where his Aunt Dawn had also died in the raid that had killed his father.
He stopped for a good three seconds before he looked guiltily at Wally again, "Can we... not tell Linda? or Jesse? or ... or anyone?" Especially not Batman, "I don't want... I don't want them to know."