A/N: I actually like Candace in this one. She's a bit more down to earth, and she handles this situation better than I would. I'd be flipping out :P Anyways, enjoy!
A Collection of Common Nonsense
Simplicity
Candace took the news that Perry was a secret agent surprisingly well. Phineas suspected as much because of her reaction the last time, but Perry was still slightly worried that she'd tell someone and tried to get that point across to Phineas. Ferb, of course, picked up on the message right away.
"Candace," the green haired boy said, as the siblings and their platypus were seated in a circle on the floor. "You have to promise not to tell anyone about Perry. Otherwise…"
"He'll get sent away or something?" guessed Candace. The boys stared at her in disbelief. "What? I've seen those secret agent movies. If the cover is blown, the secret agent has to leave!" She glared at her brothers, as if daring them to question her. They didn't.
"So, what now?" she asked after a moment's pause. "Do we just carry on like normal?"
Perry nodded while Phineas and Ferb shook their heads. Candace looked at them. "Well, which is it?"
"Well, we have to pretend that we don't know about Perry in public," said Phineas. "But, here at home we don't really have to hide it or anything."
Perry chattered in disagreement, frowning at Phineas. The red head quickly picked up on his meaning. "Oh, but Mom and Dad still can't know."
Candace nodded, expecting as much. "It's not like they'll believe us anyways," she muttered. "At least Mom never does…"
"So, it's decided," said Ferb. "We carry on as normal in public, but let Perry act himself whenever people aren't around. Simple."
Candace snorted. Yeah, simple as mud.
This was going to be interesting.