Sirius made a mental note to put frogs in Phineas' bed later this week lest he think this camaraderie would be habitual. (This was something he was prone to doing over the summers — being kind to his siblings, and then absent or dismissive or acting on prank-impulses, lest they think they were on his level.)

With the frog plan formed, he smiled at Phineas. "That usually happens the first time," Sirius said, "Try the next one."