I think you are definitely off to a good start. I see some real potential for a great story here. I would recommend paying close attention to changes in tense. The story seems to be in past tense, but does slip into the present in at least one section.
Your story flows well and is easy to read and follow. If I could make a suggestion for improvement, I would encourage you to elaborate on the setting and the relationship between Luke and his Aunt Sophie. As I was reading, I found myself needing to scroll back to the beginning to remember how Sophie was connected to Luke, It is apparent that the two have a special relationship, but a little extra information might help the reader understand why.
Overall, I think you have the makings of something very viable. Let me know when you have more added to the story, I'd like to join the adventure.
Thanks for sharing,