"Where are you going?" As Sam and Dean were about to leave, Mary wandered in, hair still wet from a shower.

"Finding Cas." Dean replied, not bothering to explain.

"Why? What happened?"

"We'll fill you in late-"

Before Sam could finish his sentence, the door to the Bunker opened and shut loudly. Cas stood at the top of the staircase, soaking wet. He descended, shoes making a sloshing noise the whole way until he was standing in front of the Winchesters.

"Good morning."

"Dammit, Cas...why'd you go out in the middle of a thunderstorm? You're drenched!"

"I like rain." The angel said defensively.

"You probably should've taken an umbrella." Sam pointed out.

"I like being in the rain." Cas huffed. "At least, I used to." He was shivering ever so slightly, and his jaw clenched to keep his teeth from chattering; like he was trying to hide it.

His dark hair was plastered to his forehead, which seemed to make his intensely blue eyes stand out even more. He was dripping all over the floor.

"Go take a shower. You'll feel better." Sam suggested sympathetically.

Cas nodded, heading to the showers.

"Dammit, he's getting water everywhere." Dean mumbled.

Sam elbowed him in the ribs. "We'll clean it up. It's not a big deal." He said softly. He knew Cas would feel bad about it. The angel had a guilt complex that rivaled his own.

After Cas was out of sight and his wet, squishing footsteps had faded down the hall, Mary spoke up. "What's going on here?" She asked in confusion. "Couldn't he just...magic his way dry? And why were you going after him if he just went for a walk?"

"Cas isn't exactly at full strength right now." Sam explained. "He tried to make a deal with some witches to find us, and it cost him the majority of his Grace."

Mary's eyes widened. "You mean he's been like this..."

"For about three weeks." Dean confirmed.

"Why didn't he tell me?" Mary asked, looking guilty. "I mean, I guess I should've noticed..."

"Hey, don't beat yourself up." Sam touched her arm. "Cas is good at hiding this kind of thing."

"He learned it from you two." Their mother observed sadly.

Dean's brow furrowed. He hadn't thought of it that way, but it was a definite possibility. He and Sam weren't exactly the best role models in that department.

"So how bad is it?" Mary asked. "What does it mean for an angel's Grace to be...damaged?"

"It means he's essentially a human. He's gotta eat, sleep, he can't heal himself...that sorta thing."

"Poor thing." Mary bit her lip. "To go from being an all-powerful creature, to one of us? That can't be easy."

Dean hated the twisting feeling in his gut as he realized she was right. "He'll be okay. He always is." He said out loud, trying to dismiss his own doubts. "It's just temporary; he should be good as new in a few months."