It Hasn't Happened Yet But It Probably Will

Since my sister agreed to let me use her card to shop online as my mother would never let me have my debit card and shop with it, I mean come on - I'm 13 and naive, go figure - I used it to buy a bunch of stuff without telling her today.
She's probably gonna find out and I WILL pay her back but she'll probably get to mum before I get the chance to explain and I'll be grounded - AGAIN.
I've been grounded all week for the first time in 3 years, it SUCKED, I do not need that happening again. FML!!