Santa is allergic to cats, so he has a policy against delivering them as gifts, but little Tommy has been SO good, and all he wants is one small kitty. Santa says OK, but instead of one, the whole litter climbs into the sack. When Santa has a major allergic reaction, the kittens have to take over and deliver the presents on time.
Santa is allergic to cats, so he has against giving them as items, an insurance plan, but small Tommy has not been bad, and all he wishes is one tiny pet. Santa claims okay, but instead of one, the litter that is complete climbs in to the bedroom. Supply the presents on time and the cats need to take-over while Santa includes a key allergic attack.