(Aww, I love this prompt. Enjoy, cutie!)
Sam turned around to the sight of Cas shuffling along the floor, draped in a white sheet, looking quite small and substantially scared.
Ever since Cas had fallen, Sam had been teaching the ex-angel all the new things he needed to do, now that he was human - how to brush his teeth, tie his shoes, eat something other than hamburgers (it was Dean’s fault that Cas thought humans could live solely on White Castle meals). But every day seemed to present something new for Cas to learn. And it looked like Cas was ready for his next lesson.
“Hey, Cas - what’s wrong? Did something happen?”
Cas merely looked up at Sam with wide, wet eyes, biting his lip nervously as he did so. Sam began to get worried - sure, Cas was a little sensitive right now, but he’d actually been pretty level-headed so far. Sam had never seen Cas this openly uneasy before, as a human or as an angel.
“Cas?” Sam said again, more softly this time. When he didn’t get a response, he reached out to grab Cas’ shoulders - making Cas jump back in alarm. Sam thought he’d seen a flash of something puffy from beneath the sheet as Cas’d moved, but couldn’t be sure.
“Cas, show me what’s wrong,” Sam insisted, trying to go with a firmer approach this time. Cas finally conceded and removed the sheet (he was wearing the yellow-and-blue stripped pyjamas Sam had bought him underneath it) to reveal the angry, red splotches that covered the lengths of both his arms.
“Am I -” Cas shivered, pausing before finishing his question - “am I dying?”
“No no no no no, Cas,” Sam said hurriedly, looking at Cas’ arms more closely and confirming his suspicions. “You’ve just got hives, is all.”
“Hives? Like, like bee hives?”
Sam laughed a little. “No, not like those hives, Cas - these hives are caused by things your body doesn’t like. Now think. What have you eaten in the last two hours?”
“Uh, nothing except those green things you bought yesterday.”
“What, the limes?”
Cas nodded his head in affirmation.
“And you’re sure that’s all you’ve eaten recently?”
Cas nodded his head again, a little faster this time.
“Well, Cas, I’m afraid to say you can’t have any more of those,” Sam said, and Cas’ face fell.
“But they tasted amazing, Sam!”
“You’re allergic to them, Cas. Every time you eat them, you’ll get hives again. Do you really want that?”
After a moment’s hesitation, Cas slowly began to shake his head.
“Now, let’s see if I still have those pills…” Sam mumbled to himself, leading Cas into the kitchen and sitting the dazed man down before beginning to search the cabinets.
“Aha!” Sam said, triumphantly holding a small box in his hand. He opened it, took out a pill, and put it in front of Cas. He also got a small glass of water and placed it next to the pill.
“Take that - it’ll help with the hives,” Sam told Cas, putting the pill in one of Cas’ hands and the glass of water in the other. “Don’t bite down on it, just take a sip of water and swallow the pill with it.”
Cas mentally went through Sam’s instructions and swallowed the pill without incident.
“I don’t feel any different,” Cas said, reaching out to scratch a particularly big patch on his elbow. Sam gently pushed Cas’ hand away.
“Don’t scratch them, Cas. And the pill will take a few minutes to set it. In the meantime, though, we’ve got this,” Sam said, holding out a bottle of calamine lotion. Sam sat down next to Cas, got some of the lotion on his hands, and began rubbing Cas’ arm. Cas sighed as he felt the relief.
“You know a lot about these ‘hives,’” Cas commented, amazed at how quickly the itching feeling was going away.
“Well, a long time ago, when I was still in high school, Dean and I went with Dad for this hunt somewhere in North Dakota,” Sam said, starting to work on Cas’ other arm as he did so. “But while we were there, both Dad and Dean got hives. I ended up having to research it and patch them up so they could finish the job, and ever since I’ve kept this stuff handy just in case Dean ever runs into whatever gave him hives again.”
“Well, I’m glad you did,” Cas said, leaning against his chair weakly.
“Here, let’s get you back to your room - sleep would probably be a good thing for you right now, and you look exhausted,” Sam said, helping Cas out of his chair and guiding him back to his room. Sam brought Cas down to the bed lightly and made sure he was comfortable before turning to leave.
Sam turned back. “Yes, Cas?”
“I…” Cas gulped, and resisted the urge to start scratching his arms again out of habit. “I - I still have trouble falling asleep. It might help me if, uh, if you stayed? Just for a little bit?”
Sam smiled. He turned off the lights, closed the door, and settled himself next to Cas, holding Cas’ hand to let the other man know he was there.
“I’m right here, Cas,” Sam whispered, hearing Cas’ breathing steady as he did so. “Just close your eyes and let sleep take you.”
And that’s exactly what Cas did.
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