Hydra Lestrange Finch-Fletchley

That depends on whether she's turned you in, and it sounds like she hasn't. Still, you've just confessed here so you can probably expect that some busybody will come along and scold you, at least. I thought you told my Mother that some boy was tormenting you. I didn't know that it was Cressida. Or that she was a boy for that matter, ha!