My Older Sister's Secret Drawer

So I was just looking through my older sister’s room, as you do when she’s out and accidentally found this super secret drawer. It has all these photos of her with like, 10 different guys in front of what looks like a concert venue or something. And there are notes too, some from friends saying stuff about parties they went to together or maybe hookups? I don’t know if she knew I’d find it though, but I just wanted to see what was going on with her life outside mine and my parents’. Like does every older sister have a bunch of crushes and stories we don’t know about? What am I supposed to do now? Should I tell Mom and Dad or should I just pretend like I never found out? Help!