There was a time when she kept up with the phases of the moon, but there had been no need. She knew that when he was recovering from the aftereffects of transformations that he would be exhausted for days. Fenrir liked to sleep in and could be quite moody and irritable. He had the opposite issue in the days leading up to the Full Moon. A burst of animalistic energy at that time often made for exhilarating visits. The man was insatiable to her benefit and delight.