I am nearly eight years older than my wife. She was seventeen when we first met, and I proposed to her before her 18th birthday. We were married when she was almost nineteen and I was twenty-six. We did not have sexual relations before we were married because:
1. It's illegal.
2. She asked me not to.
Needless to say, I got pretty bored with the cradle robber jokes, and all that stuff. Strangely enough, it was young males who made disapproving and sarcastic comments. Both of our families (neither of whom are of the "trailer trash" stereotype) approved. This was 1983, and we are still married.
The legal definition of grooming is, "the winning of the confidence of a victim in order to commit a sexual assault on him or her, now a specific criminal offence." Kuga has committed nothing than can be legally construed as statutory rape or grooming. In Japan, girls can be married at sixteen with their parents approval, yet he is quite willing to wait even longer. It is quite normal for her parents to be concerned (my in-laws were pretty concerned at first when a Marine with a high and tight haircut showed up as their daughter's boyfriend). Momoka's father's attitude, however, couldn't be more counter productive. "Lay down the law. Don't allow anyone else to speak. Declare that the discussion is over forever." It undoubtedly worked in the era when fathers had the right of life and death over their children, but it's not that way in the civilised world in the 21st century. It sounds more to me like a way to turn your daughter into a delinquent or a runaway.