N: He would be really excited - you two would be expanding your family, showing how serious you were about your relationship. He wouldn’t take it lightly though, he’d make sure everything is in it’s best state before starting the process, making sure everything was in a good state before so, from friendships to work to furniture.
Leo: The most emotion you’d get out of him in a normal conversation. His eyes would light up as he asked you when could you start the process, somehow managing to ask if you can get a pet while you are at it.
Ken: He probably likes kids a lot, but he may not have expected this, at all. He’s still a bit young, so it’d take him by surprise, but his serious side would shine through, telling you that he’s taking it seriously, actually carefully considering everything. He would be aware that his bubbly personality would be good with kids, so it’d just be up to you two to have a proper conversation and convince each other that the time is right.
Ravi: No doubt he’d be a good dad, he already has experience for caring for his younger sister - sometimes even members - so there is no doubt he would dislike taking care of someone, but he is still young, so it’d probably be best to take a break and enjoy an extended honeymoon phase. Once you guys enjoyed you time together and have the ups and downs of your relationship, he’d bring it up again.
Hongbin: He’d be pretty flustered, he did not expect you to bring it up so quickly, probably having to take a lot of time to think about it, though he’d keep it at the back of his mind because he’d be scared of the idea. He’d probably have more “what it’s” than anyone else, thinking about how yours and his career would be affected - after all, this would mean coming out unless you can keep the child a secret. He would start taking your relationship even more seriously, potentially forgetting to have fun, so you’d have to talk to him a lot to calm him down. Ultimately, you’d have to do some waiting and a lot of convincing, even if he probably would like having a child.
Hyuk: This guy is still pretty young- it’d be a bit early for you two to start talking about raising kids since this is the time your lives and majority of your independent tasks start taking place here. Both of you would have to make sure you are able to properly care for a child, which wouldn’t be right away.