Yes, by setting up a business for them

You will end up setting a business for Adelina and the three of them. It will take quite some time to determine the type of business, but in the end, you will have them open up a tailoring shop. They will end up requiring some practice though as, as even though they are self-sufficient enough to sew their own clothing, it requires some skill to produce clothing for other people, especially for nobles. But, there wouldn't any problem, since you're more than willing to give them the opportunity to do that by sending orders their way.

The first few months of operation will see the business barely making any sales other than the ones you give to it, as people are very leery of buying anything from those 'harlots'. But making a profit is not really the goal here. The goal is exclusivity, exclusivity of their pussies and wombs for your own discretionary use. You can simply give them money, but as they say, idle hands are the devil's tools; if the four of them gets bored, they may decide to find a bum of a man to play with. No, they need to spend their time pleasing you, take care of the children you put in them, and work, in those order.

As you had already spent sometime breeding Adelina, she is the first one to get pregnant. Surprisingly, it will Bera who gets pregnant next, probably from orgy. Nellie gets knocked up around half a year later, and you and Gretha finally succeeds in having a child together a month after Adelina delivers your daughter with her.

On the side note, the business would have made a modest progress with the revenue is more than enough to cover their cost of living. It could have made more, but they were more focused on pleasing you than the other customers as they should be.

But all those will be in the future. Currently, you're returning to the castle, already thinking about getting Adelina to move there and making the time to visit the four of them.

It's a busy work being a king.