Bobby led McKenna inside with her duffel bag draped over his immovable legs. She had tried to tell him that she could carry her own things, but Bobby Singer was ever the gentleman, and would hear none of it.

The Winchester brothers followed the pair inside, an expression of pure confusion pasted on both of their faces. Bobby dropped McKenna's duffel on the floor at the bottom of the stairs and pulled the young blonde into his arms for the second time. Her chin rested on the older man's shoulder, and the corners of her lips turned up for just a split second. The moment her eyes made contact with the two other men, the tiny smile disappeared.

McKenna straightened up after she gave Bobby one last squeeze, and stared at the boys with a completely unreadable expression.

Bobby stretched out an open hand with a smile. "Kenna, this is…"

"Sam and Dean Winchester," she quickly interrupted, a subtle hint of a southern accent apparent in her speech. "Your father was John Winchester, and your mother was Mary. Both of them were hunters, and both died tragically."

Dean's lips pinched uncomfortably between his lips, while Sam's jaw tightened.

"I'm sorry," she said, pausing for a moment to offer her sympathies, but quickly continued on. "From what I hear from Bobby, you two are some of the best hunters around, second only to him and your father."

Sam and Dean smiled at the kind comment, their first impression of the new girl beginning to wane.

"But I also know you started the Apocalypse, therefore making you both a couple of morons."

The boys' smile quickly faded. Apparently their first impression had been correct.

"And just how do you know all that?" Dean questioned, frowning. "More importantly, who the hell are you?"

"Dean, Sam, this is McKenna Stevenson," Bobby said, answering for her. He placed his palm in the middle of her back and gave it a proud pat.

"I thought you said McKenna was man named Ken, Bobby," Sam growled.

"I am a man named Ken," McKenna cut in as she reached down to pick up her duffel. "When the situation calls for it. Sometimes, for safety's sake, I use aliases, just like you two, but my real name is McKenna. Kenna for short."

Against his better judgment, and mostly just to see what she would do, Dean leaned forward and offered his hand. "Like you said, this is my brother Sam. And I'm Dean. Nice to meet you, McKenna."

The blonde looked down and stared at his outstretched hand for a long, uncomfortable moment. Her eyes grew large and glazed over. She didn't say a word or make any effort to shake Dean's hand. Her chest quickly rose and fell as her breathing suddenly kicked into high gear. Her fear filled eyes shot up to Dean's for a moment, nervously slid to Sam's, and quickly sought refuge in Bobby's.

"Is it all right if I go get cleaned up?" she whispered.

"Of course," Bobby answered, an unexplainable hint of sympathy in his tone. "You know where everything is."

Sam and Dean frowned at one another. Neither one appreciated the fact that she 'knew where everything was'. Apparently this girl had spent more time here than either of them wanted to admit.

McKenna nodded her thanks to Bobby, and quickly made her way up the stairs without another word. Dean at least had the presence of mind to wait until he heard the slam of a door upstairs before he went into a tirade.

"All right, who is she, Bobby? Where did she come from, and how the hell does she know everything about us?"

"She doesn't know everything, Dean," Bobby sighed. "I haven't told her everything, because some things just ain't none of her business."

"Damn, right," Sam muttered, crossing his arms over his chest.

"Which goes the same for you two," Bobby added, quickly. "Yeah, she knows about the Apocalypse, but she doesn't know a thing about Michael and Lucifer being after you two. And she doesn't know that you went to Hell, Dean. Heck, she doesn't even know about Castiel."

Sam and Dean both nodded, thankful that Bobby had managed to keep some things a secret.

"So it should go without saying that she deserves the same respect," Bobby continued. "She doesn't know everything about you two, so that means you two don't need to know everything about her."

"Bobby, at least tell us where she came from," Sam pleaded. "And what her background is."

"No!" Bobby snapped. The boys jumped, surprised at the sudden steeling in the older man's tone. His eyes instantly apologized as he glanced up the stairs.

"No," he repeated, quietly. "I can't tell you where she came from. Believe me…you don't want to know."

Sam's eyes narrowed at Bobby's cryptic statement. He glanced over at Dean for help, but his brother said nothing.

Dean understood what Bobby was saying. And even more, he suddenly felt a new understanding toward McKenna. For a moment, he wondered if the emotion might even border along the line of respect. So, the girl had secrets, and obviously some big ones. But then again, who didn't?

Dean had sold his soul and gone to Hell, tortured countless souls, and came back a broken man. Sam had gone darkside, completely defiled himself with a demon, and became addicted to the power she'd held in her blood. And Bobby…well, Bobby was still somewhat of a mystery. Even to Sam and Dean.

"Bobby, this girl," Dean said, jerking his chin up toward the stairs. "You say she knows what she's doing?"

Bobby nodded. "She's the best."

"You're sure?" Sam asked, but immediately wished he could take back the question when he saw Bobby's cold answering glare.

Dean glanced at his brother, eyebrows raised in question. "Sammy, what do you think?"

Sam seemed to think it over for a moment, but quickly shrugged his shoulders in defeat. "If Bobby says she's good, then she must be really good," he answered. "I say we give her a shot."

The decision had been made. Sam and Dean Winchester, demon hunters extraordinaire, were officially going against every instinct they had, every semblance of common sense they possessed, to trust a stranger that they knew almost nothing about.

"All right, Bobby," Dean finally sighed. "She's in, for now."

The older man smiled and handed each of the boys a beer. Sam lifted the bottle to his lips and smiled wryly at Dean.

"I sure do hope we know what we're getting ourselves into, here."