When Holly sits on Tom's lap to tell him what she wants for Christmas, she knows she's naughty enough to get a lump of coal--but she never expected to get a hand of ginger root.
Peeled ginger in her bottom burns like crazy without causing any actual harm--so the punishment can go on as long as naughty Holly deserves.
Ginger-figging has been used since Victorian times to keep girls from clenching against a proper caning because, as Holly finds out, clenching around ginger has her begging for mercy--and more turned-on than she's ever been.
From now on Holly should be on her best behavior...but with this sort of punishment, it's more fun to be bad.