you basically just gave the only 2 optionsLol she basically already accepted him as her son-in-law.
Calling it now: the father is either going to be adamant that she marry the hero or he's going to be an overprotective, doting father who will vehemently oppose Youki getting close to her before inevitably liking him too.
People who read ahead will find out the answer soon.. but I'll go ahead and say it here anyways:Why is he nervous around humans when he’s obviously way way stronger than any of them?