I think I'm going to follow the example of MGE user Ionic Zach and post a WWYD response that went too long for the comments section under my user blog as a one-shot fanfic.
This is from MGE user Steve Duck and he advises that it's in a more modern setting.
You live in apartment which you share with a lamia friend of yours. You wake up one night noticing first the heating must be broken as it is freezing and a faint taping at the door followed by a heavy thump like something hit the floor outside opening the door you find your friend has lost the strength to move due to the cold and her being cold blooded.
What do you do?
"Kígyó...? Hey- are you OK?" I ask my auburn-haired lamia roommate as I poke my head out the door.
"C-can't...move....." she chatters. "So....cold...."
I can see that she's only wearing a silky nightie to protect her from the cold, although she really didn't have any way of anticipating her current predicament. While it looks almost comical, I know enough that it could be serious business if she's left unattended in her current state.
I manage to move her to the sofa in the living room before heading back to my bedroom to retrieve the big comforter on my bed. Sitting next to her as I wrap the comforter around both of us, I ask if she's Ok.
"I'll be fine..." she says softly and lethargically, not even able to open her eyes. "I just need to warm up a bit, thank you."
I can feel Kígyó's tail make its way under the comforter and slowly start to wrap itself around me. It doesn't really bother me, though, since I know she needs all the body heat she can get at the moment. She already has her arms wrapped around me, her buxom torso pressing against me. Although I thought I'd never admit it out loud, I like the feel of her body against mine.
"This feels nice..." she sighs dreamily. "Hey....hey...do you want to make love with me?" she asks nonchalantly in the same sleepy tone.
"Kígyó..." I sputter. Even with some of the flirtatious banter between the two of us, that was completely unexpected. "I don't think we should.." I trail off.
The Lamia's eyes are open now and she's looking at me with a mischievous grin.
"Silly human...." she teases, squeezing a little tighter around me. "Just by asking you that, I raised your body temperature by an additional 15%. Perhaps we should talk about more ecchi things to maintain your current body temperature...."
"Kígyó, please...I...." I trail off as I begin to struggle.
The lamia tightened her grip on me as she gently cupped my chin with one hand and softly kissed my forehead.
"I actually would be quite happy to make love with you..." she muses wearily. "But...but the thing is- I don't want you to think I'm doing it with you just because I need a warm body to wrap myself around, so you can see the dilemma that puts me in."
"Ah! I know.....you're going to tell me all of your fantasies and all the naughty things you want to do with a certain lamia roommate of yours..." she said playfully. "It will be like bedtime stories....only better!"
"What do you mean, Kígyó?" I ask innocently.
"Don't give me that...I've seen your browser history." she playfully chides me.
"What!?" I sputter "Y-you had no business going through there...."
"I'm kidding! I'm kidding!" she teases. "But notice how you didn't deny it?"
"Then...then you'd know that this is one of my fantasies. To have...to have someone as gorgeous as you are just...just pressing their body up against mine. It just feels....nice..."
I nod shyly.
"That's kind of sweet, actually. But you're a dummy.." she playfully bops me on the forehead with a balled up fist. "Why didn't you say something earlier? I would've been glad to oblige..."
"What about you?" I ask. "Care to tell me some of your fantasies?"
It was her turn to stammer and fidget, and I was confident I could feel her body temperature rise as soon as I asked her that.
"Ah...well....you see...." she trailed off.
"Come on, Kígyó. A little quid pro quo here." I say.
"OK, fine!" the increasingly warm lamia huffed. "I...I never actually got to try this before, but...." I can feel her tense up a little but before she continues. "I sometimes fantasize about....having a guy pull my hair. Hard."
"Really?" I ask.
She nods, not quite able to look me in the eye anymore. "OK- your turn!" she says hurriedly in order to shift the onus back onto me. "Got any favorite costumes or outfits? You know- something you see a girl in and it just drives you wild?"
"Well....let's see." I say, giving her question some thought. "Kimonos are pretty cool- props to any western woman who can rock an off-the-shoulder kimono. I also like volleyball shorts, maid uniform and uh......Oh....that nightie you have on isn't half bad, either."
I feel her coils shift and loosen a little around me as I tell her that, noticing that a blush is creeping into her cheeks.
"Oh hey! How can I forget a classic!?" I yell out as I just remember it. "Belly dancer...."
"That's a good one." Kígyó remarks. "Think I have the body to pull that off?" she asks playfully.
"I don't see why not." I said. Although Kígyó had a fondness for blouses with plunging necklines and other tops that showed off her ample assets, I hadn't seen her in anything more revealing than the occasional nightie, which was pretty modest by lamia standards.
We spent the night like that just talking- although she still had be trapped in her coils- I learned she wanted to know what it was like to have legs in part because she thought it would make her ass even more spank-able and I told her that I was open to experimenting with some light bondage under the right circumstances.
When Kígyó was getting sleepier, she just listened to me talk until she drifted to sleep, nice and warm with her body coiled around me under the comforter
With the benefit of hindsight, the way we spent that night was much better and more rewarding than if she had succumbed to her monster instinct and took me right then and there. Because we were much more open about our wants and desires, that did away with a lot of the undercurrent of sexual tension between the two of us. It seemed as though nothing had really changed between myself and Kígyó until I came back from the office about two weeks later during an earlier than expected heatwave.
Kicking off my shoes, I heard Kígyó call out to me from the other side of the apartment.
"Is that you?"
"No! It's the Lamia Strangler! I'm making house calls now!" I shoot back, not sure why I'm so keen on being an even bigger smart-ass than usual this afternoon.
Kígyó sticks her head around the corner, speaking in a much quieter tone.
"Hey....listen. Remember a few weeks ago, when I said that I'd be glad to make love to you-"
"Yeah." I interrupt.
"But I didn't want you thinking I was doing it just to wrap myself around a warm body?"
I nod. That was actually pretty forward thinking on her part.
"Well...I just checked the forecast. Tonight's low temperature is supposed to be 76 degrees." she said as she was looking at her smart-phone. "Plenty warm for most lamia...but I was thinking I could make it a little hotter."
Still looking at her phone, Kígyó emerges from around the corner. The buxom, alluring auburn-haired lamia is dressed- or rather, barely dressed- in a belly dancer outfit. She pulls up a sheer cloth that was around her neck that was now across her nose. The tiny violet bikini top was adorned with tiny metallic fringes that almost acted as chimes whenever she moved. The rather ornate top struggles to contain her massive alabaster tits with each movement on her part- just exhaling could endanger the top's structural integrity
The shrill Bollywood music that's now emanating from her phone as she begins to sensually slither and gyrate to the tune doesn't even detract from the moment.
"My God, Kígyó! It's not even my birthday...." I say loud enough over her iffy choice in music. "What did I do to deserve this?"
"You like? I've been watching a how-to series on You Tube and I got this off of Lamia-zon dot com." she says pointing to her outfit, almost literally not missing a beat as her hips start to gyrate with an inhuman tempo.
She gently shoves me into one of the chairs in a move so fluid, I thought it was choreographed into her dance. I can do nothing but sit there and be mesmerized by her body sensually gyrating and swaying to the suddenly less irksome music playing from her phone. Both the effort she went through to prepare this and the finished product go beyond admirable.
I'm so caught up in her sensual dance that I don't notice right away when she's finished. The whole time I was thinking that she most likely wouldn't have gone through all of that trouble if she still considered me just a friend- especially going through the trouble to cater to a fantasy I confided in her a few weeks ago.
"K-Kígyó....that was amazing!" I said as the Lamia looked like she was catching her breath. "I never thought I'd see anyth-"
My words are cut off as she kisses me on the lips, playfully slipping me her tongue before pulling away. As Kígyó pulled me out of the chair and led me by the hand down the hallway to her room, it looked as though I had my answer.