I Borrow My Little Sister's Clothes When She's Not Home

So yeah, I totally snagged a few of my little sister's clothes while she was out with friends. I tried on her mini skirts and crop tops to feel like a rebellious teenager again, totally not for any fashion inspiration or because they make me look ten years younger in one fell swoop. Plus, the way guys’ heads turn when I wear them makes it hard to resist. But now my sister’s giving me suspicious looks whenever she catches me wearing something new that isn’t mine, and she's getting on my nerves with all her questions. Am I a terrible big sis for doing this? Or am I just living life on my terms? What do you think, would things blow over eventually if I pretended nothing happened?