It's not always the case tho. To make Mida a cuckqueen I think you also need Mida to have some "corruption" points. If you ONLY have "love" points and try to fool around with other women, Mida might not like it when she finds out by herself. I clearly remember a point where I fooled around with Fannay.. and Mida got angry at MC for quite some time. To fix that, I just needed to reload, and make it so that Mida also got some "corruption" points. I also needed to be open with Mida about that.. I don't remember if there were other conditions to make her a cuckqueen but.. That's all I can remember