That dad is sick. Fathers are supposed to protect their children from that kind of thing not aid in it 
Oh Littlelamb, any male with a high sperm count can become a father, it is a roll of the dice when a child gets a loving, caring father. They are blessed.
This miserable, creep was a father in DNA only. he had no reason to go looking for his nasty sex release on the streets, he had two captive girls at home.
I believe he should be treated in the same way the courts would treat a complete stranger.
This monster is beneath contempt, the fact the victims are related should make his crimes against his own blood carry a higher penalty then against a stranger.
Wonder how he would have been charged if the girls were his stepdaughters.???