Well considering Wolfgang's feelings for Shin, it's honestly the least he could do to keep him safe...
I fully understand why Shin is worried but at the same time Wolfgang lost someone very precious to him in the past so I also understand why he's willing to risk everything for Shin..
If this isn't a romance story, then Shin is 100% right on all his actions and Wolfgang needs to backoff and sleep with a queen. But it is romance, so Shin is making bad choices in term of feelings. The struggle of love and responsibilities, painful. But rather than Shin trying to force Wolfgang to mate w another person, he should try to find a way around it. As for the command, Wolfgang is right... If he didn't Shin will eventually work himself to death.
R u guys really blame shin??? He is KING. Someone who is supposed to be the head of a kingdom and he has strong magic that has to be given to next generations. Shin is right about this. And wolf himself made this choice to become king. So what is happening in here all is normal. As someone who works for the king and for kingdom it is normal too for shin to feel like that. I am really sorry for shin. And that command was too much.....