Use your brains

The rumors about Sir Trindon’s greed and lust are spread everywhere. It is said that whoever inside his house is free for him to use. “Sir Trindon, is your daughter’s virginity still intact?”

He remains silent and just looks at his feet.

You sigh exaggeratedly, “I thought so. By law, our future Queen must only give herself to the king. Therefore, your daughter is ineligible." Before Sir Trindon can say anything, you continue, "However, I do not wish both you and my aunt to be in a loveless marriage.” You take a breath, “I have this piece of unclaimed land. It is a marsh, with a single trade route through it."

Sir Trindon frowns as he seems to know the place you're referring to. The slightly difficult terrain was the reason why no nobles wanted it before, including him. However, as the king, you hold a powerful card. "All it needs to improve the trade is to have it's road upgrade. And by law, I can set the route's tax to be the bare minimum to maintain the road upkeep. I am willing to concede it to you for the service of your wife and eldest daughter.” You rub your chin, pretending to think, "That land for two women who are not eligible for a noble marriage, it's a fair trade, wouldn't you agree?”

Sir Trindon is clearly not happy with the offer. He's looking forward to being the father of the Queen; however, he still says, “I think it fair, but perhaps we can also agree that there wouldn't be any transportation tax for any trade along this route. Improving the road will requires a lot of resources."

"Of course. I'm a fair king."

Sir Trindon bows. "I will return to make the all necessary arrangement."

It is clear that Sir Trindon sees nothing but gold in this deal. You have to go and pick them up lest he delays sending them over and instead charges you for 'housing and feeding' the two women despite them being his family.

“Ah, Sir Trindon. I'm very much anxious to get them so I will accompany you on your trip back to pick them up”

“As you wish My King.” He bows and leaves the room while you quickly make the arrangement. Within an hour, you're inside the royal carriage with your four women, behind Sir Trindon’s carriage, which reeks of sex. Slavery has long been made illegal in your country; however due to 'grey' interpretation by people like Sir Trindon, it is possible to sell anything that you own, even if that anything is a person. Because of this loophole, Sir Trindon is travelling in his carriage accompanied by nine youthful females that he 'purchased' from a place where slavery is still legal.

Neither you and he would be bored during the trip to his land.