Or is it two cats, three or even four? Has there been some mistake, or are the fairies sending a message? Something like this, perhaps. "Dear Mrs Swan, no fairy finds it convenient to share your bed in the carnal sense. However, here is a consolation prize; the first step in your future as a crazy cat lady. Look after it well."
Grumpily, Pen gives up on the whole affair, but the fairies haven't finished with her yet.