Trying to trigger Serana dialogue

[Sean]

I have been trying to trigger the Serana dialogue with the marriage dialogue. I have NO INTENTION TO GET HER TO MARRY IN MY GAME, I KNOW THAT ISN'T POSSIBLE. I just want to hear the dialogue because I think it is funny, and I want to hear it in MY GAME AND NOT ON YOUTUBE.

What dialogue do I need to follow? because I tried, and I never got it.
I need specifics other than "Don't talk about cure," because I didn't, and I hate following the Dawnguard side, so I follow the vampires.