Soooo basically it’s “Love me and I won’t rape you anymore.” Hm.

Yep. I'd be really curious to see what would happen to Na-Kyum if he refused to do as asked. Although I already have an idea...

Unfortunately you are one of few people who noticed the obvious "threat", demand whatever you want to call it.
Seungho is going to behave as long as Nakyum will do whatever Seungho wants.
What a beautiful character development.