Warm her up as best you can.
From Create Your Own Story
You cannot simply let her die. You immediately strip off your wet clothes and toss them aside. Your family taught you how to do this. You know that you need to share body heat with her, but your size makes that awkward - you'd normally hug someone to do that, but she's much larger than you due to age, so you do the next best thing and get down and gently force her to spread her legs so that you can crawl between them to hug her around her waist at an admittedly awkward angle. Her clothes are dry thanks to being made of plants, so those can stay on, but you still end up unceremoniously pressing your face into her bosom, which you are pretty uncomfortable with for obvious reasons. Her body is cold everywhere you touch, but your body still has some heat left in it, and incredibly, you feel your heat quickly spreading to her, much faster than it should.
Within a few minutes of this awkward hugging, she opens her eyes properly, focus on the cave, and then she looks down at you. "You?" she says in a gentle, mildly surprised tone.
"Me?" you say, confused by the first word to come out of her mouth.
"I didn't think you'd be up already. I'm glad you're okay!" she says.
"Huh?"
"I fished you out of the water after I saw you fall in from way up there. You were pretty messed up from the fall, so I had to use all of the magic I had carefully saved up for winter to save you," she sighs grumpily. "I kind of forgot that without magic, I get cold like anyone else does... at least my magic kept you from freezing to death long enough to get here, I guess," she says, brushing a lock of her unruly hair out of her eyes for a better look at you.
"You saved me?"
"Yeah, but now you've saved me, so we're officially even, kid," the stunningly beautiful young woman says, smiling softly.
"You warmed up fast..."
"I'm a nymph, body heat is many times more effective for warming me up. It's a trickle of life energy direct from the source. Too bad it isn't strong enough to replenish my magic, but oh well! At least I'm still alive. Would be nice if I had my magic, though... and now I'm the one warming you up, it seems."
"A nymph?!" you exclaim, the excitement getting to you immediately at meeting a real fey. The way her warm and inviting flesh is extinguishing the bitter chill in your bones is only in the back of your mind.
"Yeah, I'm the real deal. I guess you don't get many of my kind up here? I'm not surprised. This place is miserable. I don't know why I came to the mountains, I knew I'd hate it... at least it has some nice views..." she grumbles. Her soft and warm hand slowly wraps around your sensitive back, making you acutely aware of the uncomfortable position you are in again. You let go of her and bolt upright, covering your crotch with your hands, though you immediately regret leaving her warmth and softness. "What's wrong?" she asks, oblivious.
"No need for that anymore!" you say in a feeble attempt to cover up the gooey sensations in your stomach and you quickly get dressed in your partly dried clothes, though you quickly shiver as the natural cold of the catacombs sets in on you again.
"You still aren't completely warmed up yet," the odd nymph said. "You should take those back off. It's unhealthy."
"I-I'm fine!" you say nervously. "I just want to get out of here!"
"Fair enough!" the nymph laughed. "My name is Fernweh. What's yours?"
"I'm Iolaus," you reply, trying to calm your heart and stop staring at the luscious curves of the fey.
"Iolaus? That's a cute name. Do you live around here?"
"Can we talk later?" you whine. Fernweh seems about to scold you for being against small-talk, but seemingly thinks better of it.
"Actually, we can. I don't like these caves. They aren't man-made, but they aren't naturally made, either. And I have a very bad feeling about them. Wish I had never come in here in the first place. This is what I get for following a Will o' the Wisp anywhere. It promised me it wasn't leading me astray! What was that thing doing in the mountains, anyways? This isn't a bog!" she said, getting riled up and gritting her teeth angrily. You seriously have no idea what to make of this lady, or nymph, or whatever.
The scatter-brained fey finally returns her attention to you. "I guess we'd better get going, then," she says, standing up and patting some dust off of her round rump. She stretches out her arms and legs lithely, bending over towards you to touch her toes, and you naturally stare at her lightly jiggling breasts, barely contained by the leaves of her top, as she does so. She notices you staring, and smiles a little, causing you to avert your gaze in shame, your face flushing furiously. "Do you have any idea where we should go?" the coy nymph asks as she stands up again.
You shake your head.
"Hrm. I was hoping you'd know this place better than I do. When I tried to backtrack to the entrance I came in through, it was gone. It was supposed to be in this room, but... there's no way out here anymore. I was going to try the other tunnel in here, but then I got too cold to move around. I would talk to the mountain for help, but I'm not well acquainted with stones, I'm more of a soil kind of girl. Even still, the rocks of this cave won't speak to me no matter how loudly or politely I talk to them," Fernweh says, reaching out to touch one of the mossy walls thoughtfully. "Either they hate strangers, or something else is keeping their mouths shut. I wish a dwarf was here, there's not a stone that they couldn't chat up."
"What?" you ask, scratching your head in confusion.
"Um. Don't worry about it, it's a nymph thing," Fernweh shrugs. "But we do need to find our way out of here. Do you have any ideas?"
"My mother taught me to go to the source of any wind you feel in a cave, but the air is so stifling in here, it's as if the wind is pushing on me from all sides. I can't tell where it's coming from," you say.
"You're right, I feel that too. This place is definitely dangerous. Whatever you do, don't wander off, okay?" she said, putting her hands on her fertile hips.
