"I cannot eat that Dean." Cas' face was blanched and the recently fallen angel was nearly doubled over at the small motel room's table. Sam reacted first, grabbing both of his arms and steering Cas toward the bathroom.
"What the hell, Cas!" Dean swore before following his brother and the newest Winchester into the bathroom. They were in the middle of a hunt and the last thing they needed was one of their group sick. Sam ran to the sink for a cup of water as the sound of Cas' retching spread across the hotel room. Dean could only stand close by and hope that it wasn't anything serious.
"What the hell did you give him?" Sam demanded as Cas' vomiting turned into painful-looking dry heaves.
"We were just eating burgers Sam. I mean, we grew up on them. I figured it's a good way to bring in a new Winchester." He answered slightly defensive of his favorite burgers. Sam may have switched to mostly healthier options, but Dean couldn't give up the food he knew so well.
Sam rolled his eyes and helped Cas to his feet after his pale face hit the toilet seat, his body exhausted from the lack of sleep and food he'd had lately.
"Well he's going to have to eat something. He's starting to feel thin." Sam commented as he led Cas to one of the hotel room's bed. It had only been a few weeks since they'd gotten out of purgatory, and both Sam and Dean had noticed Cas picking at his food and even going so far as hiding it.
"We can't make the man eat, Sam." Dean growled as he finished his own burger. He wasn't mad, just frustrated that he helped save his friend, but he couldn't save the whole man.
"I'm sorry." Cas whispered. He sat up on the bed, dejected and staring miserably at Dean.
"It's not your fault Cas. You've just got to get used to everything." Sam encouraged.
Cas shook his head and continued speaking, "I cannot eat what you eat. Do you not remember facing the horseman Famine?" Sam and Dean nodded. It wasn't an easy thing to forget. The powerful horseman had Cas eating raw hamburger on the floor of a bloody restaurant, and then it clicked.
"Cas! I completely forgot about the burgers you ate!" Sam's voice was dripping with concern. Dean burst out laughing and did not settle for at least a minute.
"It's the burgers?" he laughed harder when Sam looked upon him with disapproval written all over his face.
"We can buy something else to eat Cas, especially if they make you sick." Dean clapped Cas on the back and reached for the Impala's keys that lay on the table.
Cas shook his head, "I just didn't want to be a burden." He smiled weakly at the brothers. Dean rolled his eyes before pulling Cas to his feet and opening the motel room's door.
"I've already got one brother that I have to look after. Another grass nibbling pretty boy won't hurt too much."