The first victims reacted very well to the mutagen. They transformed in full functional Dragons. During the transformation, no one can say if they are male or female. But a side effect let them become very horny.
Now, the new females request the first best male Dragon for copulation. Some masculine testobjects however remained masculine. They mate intensive with the new female dragons. Eight copulations are normal for the new male dragons. Good ones came to fifteen.
Her next question is, how can she infect the earth effective with the mutagen. At once came her an idea. "I link the mutagen with the virus, that initiate a cold."
The invasion can earlier begin, at 2006.