Possible Clues:

• Family member with a window to the world
• Purr-fect roommate
• Paws-itive homebody?
• Tabby not leaving the house
• Kitty that doesn't leave the house
• Windowsill occupant, perhaps
• Feline that doesn't stray
• Animal that might be found curled up on a windowsill
• Housebound feline
• Cooped-up feline