My Sibling's Secret Room.....

So there's this thing with my sister... She's two years younger than me, and ever since she was a kid, she's been super secretive about her room. Mom would always remind us to knock before we enter, but I never took it seriously until recently. One day, I really needed something from our shared bathroom across the hall, which is where her room is located. She wasn't home at the time... so I thought, hey, no harm in peeking inside for just a second, right? Well, there's this big wooden door to her room that always looks closed and locked even when it's not. I opened it carefully and walked in. It's like stepping into a whole other world... full of stuffed animals everywhere, piles of magazines under the bed, books stacked haphazardly on every flat surface... The walls are covered with posters of some band she follows religiously. There’s also this big glass case where she keeps all her collection of crystals and stones, she's really into that kind of stuff lately. I was just standing there looking around when suddenly, the door creaks shut behind me. My heart starts racing because it sounds like someone's coming... but no one is. Just my imagination playing tricks on me. Still, I felt pretty guilty about invading her space, so after making sure nothing looks out of place, I sneak back out quietly and close the door behind me... Now every time I pass by that room, I feel kind of weird, like there's an invisible wall between us because of this....