Start lining up eveything you can about who was there, when you were alone, any proof you may have that you did not do this. The mothers statements and the CPS earlier investigations will only hurt you at this point. they will argue that it has been this way all along but you have been the one to force the kids to recant and now they finally have proof.
Pictures and the girls testimony is all they NEED. You will have to find enough PROOF that you didn't do it to get the charges dropped.
I thought that there was a no contact order? Did that get dropped?