From a dream, this girl is a part of a race/religion dedicated to the daylight hours. They draw sustinence from the light, etc. In the dream she had the power to burn things/people with her touch (basically a really bad sunburn or worse) and the ability to radiate light at will. If you want to know yes the typical opposits attract thing happened and she became enamored with a male of a race/religion that is dedicated to the moon or night time hours. And yes he draws sustinance from moonlight and sunlight is too abrasive for his system.