Y/N has gotten pretty good at keeping her relationship with Steve a secret—at least from her family. At home, she plays it cool, but her diary holds everything she doesn’t say out loud, from her feelings to the more personal parts of their relationship. When her younger sister accidentally finds it and shows Hopper, Y/N expects the worst. Instead of blowing up, though, Hopper is more caught off guard than anything else—realizing his daughter is growing up faster than he’s ready for. What follows isn’t a huge explosion, but an awkward, emotional conversation that shifts things between them—less about punishment, and more about trust, boundaries, and finally being honest.