Solution?

Now that she had reunited with her Master, and returned to the real world where their family and friends were waiting, Fenrir was very happy. She was now much stronger, stronger than even her Master, not that she would ever harm him. The only reason she had become strong was to protect him...strong enough to bond they shared together, and the hope she had for the future...

During the time she had spent with Eva, Fenrir realized that there was a greater problem with her body than she expected. Not only was she unable to bear children, but as a result of her body always healing back to her 'default' state, she could never be with her Master without experiencing a lot of pain. Though she could bear such an 'insignificant' amount of pain, Fenrir knew that her Master would be heartbroken by her suffering. He might give in if she pleaded to him, but this would, in turn, make her Master sad.

Fortunately, her Master always kept her in his heart so, even without her saying anything, he was the one that came to her. Not only did he have a potential solution, which made her heart do backflips, but he also accepted her feelings. No longer were they simple Master and companion, but prospective lovers that would walk through eternity together. That night, though they didn't have sex, Fenrir slept with her Master completely naked. The warmth was the same as it had been in the past, but the meaning behind it had changed. Though she did not yet truly know what it meant to be a 'woman', Fenrir knew what it meant to be loved and sought after...

The method her Master had come up with was known as 'Cultivation', a means by which she could increase the strength of her soul. Doing so would allow her to fundamentally change the nature of her existence, even enabling her to completely recreate her body in some circumstances. It wouldn't be easy, as such methods opposed the very flow of fate, but Fenrir had an eternity to work with. Even if it took until all the stars in the sky burned out, she would never give up trying to reach her dream...

In order to prevent her Innate, the skill she knew as [Insatiable Hunger], from overwhelming her mind, Fenrir needed to practice her control. She needed to possess a strong mind, free of emotional stress, and a calm heart, unperturbed by any matter. Her Master gave her a strange book, called [Mind of Still Water, Heart of Eternal Ice], that demonstrated a technique to achieve this state. According to the description, it would allow her to surpress her emotions almost entirely, having a mind and heart similar in name to the technique. The only thing that would be able to melt her icy visage would be the love of her Master, something Fenrir found solace in as she began her training in earnest...

To aid in her training, her Master also gave her a very comfortable bed, known as [Pristine Jade Ice Bed]. She had always had a very strong affinity with Water, Ice, and Yin elemental Laws. Sleeping on the bed helped increase her strength and, as it was put in a room only she and her Master had access to, Fenrir was very fond of sleeping on it. She enjoyed how the ice crystals would form on her fur and, on occasion, how her Master would sleep at her side...

(Fenrir's Commentary: 'Even if my heart became like a glacier, I always believed my Master would be able to melt it...')