I have another go. I tend to have strange ides, and they won't let me rest. So I had to write it, and having written it, I might as well share it. Someone out there might actually like it. You never know.
The Lyrics are "Two for Tragedy" by Nightwish

Cassandra, the Lone wanderer. Utterly alone, close to dying, and lost in painful memories. To follow him into death would have been easier, and yet she chose to live.

Sleep Eden sleep

My fallen son

Slumber in peace

Cease the pain

Life`s just in vain

For us to gain

Nothing but all the same

No healing hand

For your disease

Drinking scorn like water

Cascading with my tears

Beneath the candle bed

Two saddened angels - in heaven, in death

Cassandra didn't know if finding her way to Agatha's shack had been a blessing or a curse. Of course, the old woman had saved her live as she had come crawling towards her door, but being alive meant to remember. And Remember was the one thing she didn't want to do right now. Never more, in fact. But she had had the choice to live or die, and she had chosen. Had chosen life over death, and now would have to live with her decision.

If only she could stop remembering. But the memories were there, right under the surface of her consciousness, and she only had to close her eyes to relive them in painful clarity.

It was a cold night out in the wastes. Cassandra was freezing, huddled in her blanket and still dripping wet. Had ever she cared to count, she could have known that it had been the seventeenth time that Fawkes had saved her life, this time by pulling her out of the river she had fallen into after a slip on the bridge. She had lost consciousness for a second upon hitting the water surface, and her power armor had dragged her down into the murky depths as if she had been a sack of stones. And even as she realized that now, she was going to die, a large hand had grabbed hers and pulled her up, into the air and sunlight again. He had dragged her ashore, helped her out of the dripping armor, and now she was sitting shivering beside the little fire he had built.
Staring across the flames, she watched him settle down opposite her, pulling up his knees a little and resting his elbows on them. He didn't look at her, but into the fire, and she watched the play of light and shadow on his face as ever-changing as his actual expression was still.

"Fawkes", she whispered.
He looked up at her, eyes half closed.
"How many times more are you going to save my life?"
A small smile tugged up the left corner of his mouth. "As often as you need it, friend."
"Without ever asking for a reward?" She tilted her head.
Fawkes snorted. "I told you often enough that I probably can never repay you for freeing me out of my eternal prison, Cassandra."
"Never?"
The big mutant shifted his position and leaned forward a little. "What is it you are getting at, Cassandra?"
"I only…" She felt a little at a loss for words, but had the feeling she had to offer. "I mean, I would consider your debt more than paid. You are free to go, Fawkes. I really mean it." Then she swallowed, because although she meant it, she did not relish the thought of being without his company again.
"Like that, is it?" Fawkes slowly got up. "If you do not want me to follow you any more, you could just have said so." Then he turned and vanished into the shadows before Cassandra even could get up.
"Fawkes…" Her legs were still a little shaky as she stumbled after him in the dark, cursing herself inwardly for a fool and worse. "Fawkes, please, that's not what I meant!" The night was pitch black around her, and she hit a rock with her bare foot. Hissing with pain, she limped onward. "Fawkes?"

"Careful!"
His big hand grabbed her arm and only then did she realize she had been heading straight for another big rock and would have run heads on into it had he not stopped her.
Shivering with cold as much as mild shock, she turned to face him. In the darkness, she could only make out the outline of his bulk as a shadow somewhat darker than the darkness around him.
"Please, Fawkes, I'm sorry. I…" she cleared her throat. "What I meant was…"
"I understood what you meant", he gave back. "You wish me to go."
"NO!" Cass stomped her foot, which hurt, as she was barefoot. "No, I am just a stupid idiot unable to form her thoughts into proper words! No, Fawkes. I wanted you to go… if you wanted to."

A long silence followed her words.

"Ah", he finally said. "And if I choose not to want to leave you like that?"
"Then I'd…" She took a deep breath. "Then I'd be more than glad."

Another long silence.

"Let's get back to the fire then", he said, and she followed him, or tried to, at least. She kept bumping into rocks, and then suddenly bumped into him, as she had not seen him stop.
"Sorry."
He turned around. "It seems I have a better night vision than you do." His voice could have held the trace of a smile.
"So it seems", she gave back. By now she was freezing so much, without a fire or blanket and her underwear still moist, that her teeth were clattering as she stumbled around in the darkness.
"No sense in you breaking an ankle", she heard his voice, and suddenly felt herself being swept off her feet. "Holy god, you are cold as ice!"
"I know", she whispered as she let her head fall against his shoulder.

He carried her back to the little campsite and sat down as close to the fire as possible, but seemed reluctant to set her down. Which was fine with her, as she felt reluctant to leave the warmth of his embrace. So they sat awhile, until Cassandra became aware of the fact that she was sitting on his lap wearing nothing more than wet underwear. And, there was no denying it, so was he.

"I don't want you to ever leave me", she whispered then, but all he replied was a low rumbling sound.
Smiling at her own recklessness, she lifted a hand and ran a cautious finger down his chest and up again.
"Stop that", he said in a very low voice, his eyes firmly closed.
"Why?" She stopped, but left her hand where it was, the index finger resting in the grove at the base of his throat. She could feel him swallow.
"Because it could lead to things I will regret", he gave back. "We both will regret."
"Why?" Cass asked again.
"Why?" He finally opened his eyes. "Because I am a mutant, and you a human woman. Because there are some things that are best left undone. Because I do not want to cause you any pain."
"But why might you cause me pain?"
"Can you really be that naïve?" His voice was almost a growl. "I am almost twice your size, Cassandra, and a mutant. And I…" he swallowed. "I fear the part of me that… I fear that the primal part… will pull me away for good, if I let go."

Cassandra could understand that fear, but she also knew that she wanted this, more than she had wanted anything in her life so far. That moment, when he tried to refuse her to keep her safe, she realized that what she wanted was him, all of him. All of the little, tiny feelings, rising and vanishing again under the surface of her consciousness, all of the tugs and pushes in her belly as she had looked at him in the past months, suddenly came to a culmination in this realization.

"Fawkes." She shifted so she could look into his face. "I know I am a clumsy lout you constantly have to keep rescuing. As was proven today."
A tiny, lopsided smile appeared on his face for a second.
"But listen", she went on. "I just realized something. And that is that I want you. All of you. And I may be clumsy at times, but I know I am strong. In more than one way." Then she laid her hands on his cheeks, to force him to continue looking at her. "I am strong. I know it. I want you, and believe me, I fear that primal part of you, too. But I want you, and if that part of you is part of the bargain, then so be it. I am strong, and I know I can contain the beast."
"You do not know what you are asking for." His voice was as dark as the night around them.
"I do." She leaned closer. "I see it in your eyes."
He didn't reply at once, just looked at her, and then shook his head. "I shall cause you pain, there is no way I would not. No Cass, I do not want to do this."
They stared at each other for a long time, and finally, Cassandra let her head drop onto his shoulder.
"Fawkes", she whispered. "Why do you not trust me?"
"Trust you?"
She looked up and found him stare down at her, his eyes wide.
"What makes you say that?"
"But you don't! You don't trust me to be strong enough for you!"
"Trust has nothing to do with it. At least not trust in you. It is trust in me that I lack."
"Yeah, the beast and everything." She gritted her teeth. "And you don't trust me to handle it."
He leaned closer. "I am minded to let you try, just this once, so you would know what you are talking about, girl."

Cass just smiled.
He didn't move.

"Fawkes", she whispered again.
But he just stared at her. She could see the pulse in his jugular vein, throbbing fast and hard, and she heard his breath, coming hard and fast, as well.
"Can you fall in love with a monster?" Cassandra asked.
He chuckled tonelessly. "I would not know, being the monster myself."
"I think you can", she whispered, then leaned closer until her lips brushed his earlobe, which made him shudder. "I want you", she whispered. "Monster."
He growled softly, and shook his head. "What if I hurt you?"
"Then it is my fault alone", she gave back, and slowly moved her face back, her cheek brushing his, until she met his lips with hers.

As she was only wearing underwear and he hardly more than rags, it took them only moments to undress.

And yes, he did hurt her. He filled her with a mixture of pain and pleasure so intense she found it hard to handle. But it was what she had asked for, it was what she had wanted. Him, in his whole being. Yet when she opened his eyes, she saw something that scared her more than a little. He was gritting his teeth, had stopped moving, and a low, heavy groan escaped him, so flat as if he was trying to swallow it instead. And Cassandra realized that this was the moment he had been dreading. That this was his primal part trying to take control of him. But had she not said, and firmly believed in, that she could handle the beast?

Could she really? The look in his eyes told her that he did not want to go on, but she knew he had to, or he would lose himself completely. And she swore to herself that if he could no longer contain the beast, then she would. And realizing this, she felt herself relax, her fears dwindle, and she opened her soul to that part of him instead of fearing it and trying to chase it away. And as their eyes met, she welcomed the beast, and in doing so, she could contain it even as it took control of him. Something inside her gave, not painful, not pleasant, but something told her this moment that no other man would ever be able to possess her, make love to her, none other than him.

He collapsed on top of her, growling and gasping for air, but all she could do was smile and run a hand over his head, down his neck and rest on his back.

"I am sorry", he finally murmured into her shoulder.
"Don't be", she replied. "You didn't hurt me that much at all."
"That was not what I meant." He lifted his head to look at her. "We both knew about the pain. I am sorry for believing you not strong enough."
Cassandra chuckled and then sighed. "Get off me for a second, will you?", she said then with a smile. "You're awfully heavy."
He rolled off her and cradled her into his arms, burying his face in her hair. So they fell asleep, and the sun that had said good night to them as friends now greeted them as lovers.

With a heavy sigh Cassandra let her head fall back onto the pillow and stared at the ceiling. That was where it all had started, and had led to her lying here in Agatha's old, ramshackle hut, occupying her bed, too weak to move. Why had she chosen life? Why?
But she knew perfectly well why. The reason why she had chosen life over death, a life without him, was lying at her side.

Now let us lie

Sad we lived sad we die

Even in your pride

I never blamed you

A mother`s love

Is a sacrifice

Together sleeping

Keeping it all

No sympathy

No eternity

One light for each undeserved tear

Beneath the candle bed

Two souls with everything yet to be said