I have a similar story from when I was younger. One morning, I woke up much earlier than both my mom and dad. Knowing there was a chocolate cake in the fridge, I helped myself to the frosting on it. Wanting my mom to know what a "good boy" I was, I went into their bedroom to wake them up. Story goes, I walked in, chocolate frosting smeared all over my face and said to my mom "I didn't eat any cake, Mommy. I didn't eat any cake..." True enough, I hadn't...but that frosting, that poor, poor frosting was outright destroyed. LOL.
You poor thing. I took great pains at seven to lift the top layer and scrape the middle out, too. Since my granny was getting old and I assumed very forgetful, I placed the two cake rounds on the cooling rack, so she would think she had yet to frost it. I think that might have worked, but for my Grandfather sitting on the porch ... if I’d have used that side door instead of the front screen door, maybe I could have escaped!