"Aiyaaaaaa, doctor foreigner, I'm fine really. Just needed a nap. Bit hard to sleep without my bedwarmer over here. Ningning just gets worried, I'm sorry to bother you." 

And then he immediately collapses, obviously.

"You are super not fine -" Merrin starts, and then trails off, since apparently now is not the time to have that conversation. Or any conversation. 

...Bedwarmer? Is that a technology thing or is he talking about Wen Ning? 'You're mine and no one else is allowed to touch you'??? Are they....dating. Is this just locally considered a normal kind of interaction for someone to have with their personal prisoner of war???? 

That is not strictly speaking a medical-emergency-related concern and so Merrin will set it aside to think about later. She sighs. "Thank you, Wen Ning. At least he knows who I am now and hopefully he'll remember and not panic so much about my presence in his tent. I think he's probably responsive enough to swallow safely without choking, I just - need to be careful not to startle him like that again. Here - I need you to help me get him sitting up a bit, you're going to need to hold onto him..." 

Merrin has enough experience at wrangling semiconscious people to do this gracefully, though she really doesn't appreciate doing it on a still-very-messy tent floor rather than with a proper hospital bed. She guides Wen Ning through propping Wei Wuxian against his shoulder, and then goes hunting through the detritus in the tent for a spoon or usable substitute for one. 

She finds a spoon that's serviceable other than being covered in dried food.

Wen Ning is petting Wei Wuxian's hair with one hand, holding his hand and presumably feeding him qi with the other, and murmuring soothing words too quietly for Merrin to hear. 

Fine. Okay. Consciousness. Wei Wuxian, grandmaster of demonic cultivator, can do this. His eyes are open and everything.

Awwwwwwwwwwwwwwwwwww. That's very cute. ...Seriously, are they dating. Normally she would not put very high priors on that, men who are romantically attracted to other men are rare, but who knows what the base rates are in bizarre questionable fantasy world. 

She scrapes most of the dried food off the spoon with her thumbnail and then rubs it as clean as she can on the hem of her shirt, and then rescues the vessel of sugar-salt-water of carefully measured concentration, and settles herself next to him as comfortably as she can. This is going to be incredibly tedious. 

She coaxes a spoonful of liquid into his mouth and praises him for swallowing it and counts out thirty seconds in her head and does it again. It would be very convenient if at some point he wakes up enough to hold the container and drink himself, but she's not really expecting it, and it's probably better for her to stay in charge of the rate, anyway; he's probably very thirsty, but if he tries to chug it then he's likely to throw up and then they'll be back to square one. 

Right now, Merrin would give up most of her life savings in exchange for a couple of liters of IV fluids, less because it's a critical medical need - you totally can treat a starved and badly dehydrated person with oral fluids - and more because she is SO BORED. This is going to take, like, an hour. Longer if he can't consistently stay awake for it. 

Wei Wuxian is bored much more quickly than she is. 

"Ningning, I want congee," he says after the fifth spoonful.

"The doctor says you can have some later?"

"You should put spices in it," he says to Merrin. "Or feed it to me faster."

“I’ll think about it. When did you last eat solid food and when did you last drink any water?”

"Uhhhhhhh."

"I'm sorry, zhuren."

"It's not your fault, Ningning, it's those asshole Jin's fault and I'm going to kill them."

“Well, you certainly look like you haven’t been eating anywhere near enough for weeks if not months. And you’re badly dehydrated, though for most people that really only takes a day or two. If you can get down half of this and not throw up over the next thirty minutes, you can have - actually, what is congee?”

"Rice porridge? You put things in it."

“Oh. That seems almost ideal, actually. In a few minutes. Digesting food is actually going to be hard on your body if you haven’t been eating much for a long time.” She frowns at him. “How are you feeling? Do you know where you are and -“ she has no idea what the local calendar is, “- and do you remember what’s happened here over the last few days?”

"I'm in my tent. The Jin stole Wen Ning so I spent a lot of time threatening to murder people until I got him back? And there were a couple of fierce corpse attacks and a battle and someone found a cemetery they thought I could use."

“That sounds very stressful.” She gives him another spoonful. “I guess it’s not surprising you weren’t getting much sleep. But you really need to rest for a while now. Until you’ve gained back some weight. Or you’re going to collapse again as soon as you try up if anything strenuous.”

She gives him more sugar-salt-water. Holds eye contact with him. “Listen to me. You can’t just brush this off. This is serious. You could have died.”

"Aiyaaa, I'll be fine. Haven't died yet."

“I am really not finding that a compelling argument. You’re staying put for at least the next couple of days.” Merrin doesn’t actually expect that to be a problem. She’s pretty sure the kid would pass out if he tried to stand up, right now, and that he’s going to fall asleep the instant they let him lie down and stop bothering him.

“Here, can you hold this?” She offers him the container, wrapping his hand around it with her own h hands overtop to hold it steady. “You can drink some more. Not too fast. And tell me if you’re feeling nauseated at all.”

"This humble one can give him herbs to help with the nausea?"

"Stop that, you're mine, you outrank some random foreigner even if she's a doctor."

"Yes, zhuren."

“I have never seen any of these herbs before and I have no idea which ones are treatments for what. Unfortunately I don’t usually carry an entire medical kit with me when I fly, and anyway my carry-on luggage doesn’t seem to have made it here. I guess I’m lucky my clothes did.”

She supervises Wei Wuxian in sipping some more oral rehydration solution, ready to gently pull it away if he tries to gulp it too fast. 

“How often do there tend to be, um, fierce corpses attacking?” she asks Wen Ning. “Or other attacks, I guess. Trying to figure out if we need to plan for guarding him while he’s recovering. He absolutely should not be getting up today and probably not tomorrow either.”

"Other people can handle it for two days, there are a lot of cultivators."