I was thinking earlier what if both of the plant are females? And that's actually not a problem, you'll just be making feminized seeds instead of regular seeds. But, to do this, and do it along with this thread and tutorial you'll want to be prepared. In the event both plants are girls I will be brushing a product called Colloidal Silver onto the nodes of a single branch on one of the plants. This is the CS that I personally use. I've tried a number of them and this has worked the best for me. AND it's WAY cheaper then the other products I've used.
This is a 16oz. bottle and cost me $20.00 if my memory serves me right. It is 50 ppm which is stronger then the "name brand" sprays I've used. Also find yourself a small (2-4 oz. cobalt blue or brown glass sprayer bottle) into which you'll pour an ounce at a time. Always keep the CS in a cool, dark place and only take out the bottle to add more to your small spray bottle. If both plants are girls we'll be employing this spray.