He was not confident enough.

  Alan’s mind was reeling, should he accept her invitation or not? Things were going too fast for him, one moment they had a pleasant conversation and the next she wanted to bed him. He weighed the implications in his mind. She was an Obscurian woman some ten years his senior and probably very experienced. Would he even be able to satisfy someone like that? Besides, she was his new superior. Weren’t relations like that frowned upon? Additionally, wouldn’t he be cheating on Luna? As alluring as Maria was, he decided to err on the side of caution and not visit her tonight. If she was insistent and he had a chance to talk to Luna about it, maybe it would happen another day.
  Alan gently picked up the sleeping furball and cradled her in his arms. She stretched, rubbed her head to his chin and purred almost immediately. Leaving the dining room, he carried her down the hall to his new chambers. It was a small room—only a single bed, a closet and a writing desk—but it would be enough. He let Luna down and she started transforming to her human-self. Alan had seen the process quite a few times by then, but it was still mesmerising to him. He gulped, as he saw her naked form again. It would be very hard to keep his agreement with her.
  ‘Finally, alone again, love,’ she smiled broadly, ‘I thought that woman would never stop talking.’ She slinked into the small bed and covered herself with the blanket. ‘So, pretty cosy room we have here,’ she grinned up at him, ‘Remember our deal? Undress, would you?’ Alan did as she said and disrobed to his underclothes. She lifted the blanket to let him slip under the covers. When he settled in, Luna cuddled up to him, ‘You’re so nice and warm, Al.’ The pair soon drifted off to sleep, clinging to each other.