How to make my parents let me get a ferret???? Please help 10 points!?

So last year on thanksgiving my parents sold my two ferrets because they smelled awful (we got them off craigslist and it said they were descented but I have my doubts). One was mine and one was my sisters, then my sister moved out and it was hard for me to take care of both of them and that's another reason they were sold. But anywho, I just took a nap and had a dream about my old ferret. The dream was so real it's like I woke up and could still feel his wiggly body. But he's gone. The dream made me miss him so much so how can I let my parents let me get a new one? Just one so i can take care of it. Please help I want One again so bad!!!