This one's one of my favorites. It's a collab with Poe, so. . .

Yeah. Sung by an original character, Truff (featured in my other/only fanfic plus a future story)

On my first Jellicle Christmas, my brother let me see
a Demi in a catnip tree

On my second Jellicle Christmas, my brother let me see
two Calicos looting
and a Demi in a catnip tree

On my third Jellicle Christmas, my brother let me see
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my fourth Jellicle Christmas, my brother let me see
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my fifth Jellicle Christmas, my brother let me see
five Pollicles
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my sixth Jellicle Christmas, my brother let me see
six henchcats creeping
five Pollicles
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my seventh Jellicle Christmas, my brother let me see
seven kits a-squealing
six henchcats creeping
five Pollicles
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my eighth Jellicle Christmas, my brother let me see
eight Pekes a-pocking
seven kits a-squealing
six henchcats creeping
five Pollicles
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my ninth Jellicle Christmas, my brother let me see
nine toms a-leaping
eight Pekes a-pocking
seven kits a-squealing
six henchcats creeping
five Pollicles
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my tenth Jellicle Christmas, my brother let me see
ten Misto bolts
nine toms a-leaping
eight Pekes a-pocking
seven kits a-squealing
six henchcats creeping
five Pollicles
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my eleventh Jellicle Christmas, my brother let me see
eleven tails a-wagging
ten Misto bolts
nine toms a-leaping
eight Pekes a-pocking
seven kits a-squealing
six henchcats creeping
five Pollicles
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi in a catnip tree

On my twelfth Jellicle Christmas, my brother let me see
twelve cats a-dancing
eleven tails a-wagging
ten Misto bolts
nine toms a-leaping
eight Pekes a-pocking
seven kits a-squealing
six henchcats creeping
five Pollicles
four couples cooing
three queens a-quilting
two Calicos looting
and a Demi fleeing Macavity