So, I'm back. Sorry I haven't updated in such a long time. Anyway I was reading my own story and I realized something. Yukino does have some zodiac keys, but that's because since Lucy is the ruler of all the races, all the zodiac keys appear twice so other people have a chance of using them. However if she was to bestow the keys she has onto someone else, then the other key would reappear in her hand if no one else currently owned it. (This is a hint for the next chapter.)
BTW I will be updating by the end of next week as I already have chapter 20 written. Yay! Sorry for keeping you guys all waiting for this long.