The Story About a Responsible Father

Once upon a time, in a village far away, lived a man with two most beautiful daughters the Earth has ever seen. Or, the Earth has never seen? Depends what do you mean by Earth.
This man considered any potential lover of either one of his daughters an undesirable alien. He believed that the only male person that has a right to look at his daughters was himself.
Oh, how pretty were his daughters. They were two different pages of the same sheet. One was easy going, other was deliberate. One was benevolent, other was merciless. One wanted her longest relationship to be with a biker, and other wished to spend the rest of her life with a physicist.
Their father prayed every morning that no man ever thinks about his daughters' beauty. For him, they were too gorgeous to experience human loving and admiration. His prays were so sincere that God himself could not believe their candidness, and so he decided to check how serious this man was.
Every Sunday, the man was organising a barbecue for his family. They lived in a medium size house with the biggest yard in the village, that was ending with a cliff by the shore of blue Danube. This cliff was so high, that if an elephant weighted three tonnes jumped off of it, nobody on the cliff could hear any sound as he enters the water. The man could never see any use of such a high cliff.
Two daughters and their father ate vegetarian meat peacefully, when they saw a motorbike at the other side of the yard. It was going fast, so the family soon saw the people that were coming. A tall, strong guy with pitch black hair and eyes, dressed in a leather jacket and skinny jeans was maneuvering the vehicle. The young and skinny man, whose laughter exuded with doubt and whose organs of vision were hidden besides thick, round glasses, was sitting behind and giving directions. At least that is what they saw in moonlight.
The members of the male gender population stopped besides the table dramatically, and looked at their prettier acquaintances. It was love at the first sight.

The big father interrupted the silence: "You can park down there", he pointed his finger behind himself. The biker sat on the motor and turned it on. "It is better if both of you drive; you are heavier, so the gravity will pull you harder", dad suggested. The scientist-like guy sat behind his friend.
They started driving slowly.
"Go lower", the man navigated them.
They went a bit lower.
"Lower, lower", the man continued.
They listened to him.
"You can go lower, there is plenty of space down there."
They added a little gas.
"Yes, that is right. Just a little more.", the father seemed excited.
The duo proceeded to their parking spot.
"Almost there! Go just a bit lower..."
Silence.