The secret to a shared reading nook is that your cat must own part of it outright. A seat designed only for a human, with a cat tolerated on the edge, ends with a cat on your open pages; a seat designed in two zones — your cushion, her claimed spot within arm's reach — gives her status and warmth beside you without competition for the same square foot. Start from the window she already chooses, because a nook built around her existing habits gets used from the first day.
Structure: width, stability, and sun
Choose the widest window you read near and build the seat at or just below sill height so she can watch outdoors at eye level. The platform must be rigid under both of you; a wobbling board teaches a cat to distrust the whole arrangement. For your side, a firm cushion you can sit against for an hour; for hers, a slightly raised pad, shallow box, or folded fleece with texture she can knead and scent-mark. If the window gets strong sun, add a sheer curtain or a shaded corner of the platform so she can move out of the heat without leaving the nook, and check the surface temperature on bright afternoons before she settles.
The small furnishings that make it hers
Place a scratching post or pad at the exact point where she enters the nook — cats love to scratch on arrival in a valued place, and giving that urge a target protects your upholstery and your books. A low basket with two or three quiet toys, a lick mat for occasional treats, and a water bowl on the floor nearby complete the setup without clutter. Keep a dedicated throw for her side that you wash less often than your own cushion cover; her scent remaining in place is what tells her this spot is permanently hers, while your side stays fresh for you.
Reading together without the page battles
Expect her to test the book itself at first — books smell interesting and sit exactly where your attention is. Redirect calmly: move her to her pad, offer the toy basket, and stroke her there until she associates her side with the petting. Timing helps too; a short play session before you sit down burns off the energy that otherwise becomes page-batting, and reading at the same general time each day turns the nook into a routine she anticipates rather than interrupts. A bookmark tassel is, to a cat, a toy you installed yourself, so choose a flat ribbon marker or keep the book closed face-down when you pause.
Keeping the shared seat working for the household
Shared furniture drifts unless someone owns its upkeep: her pad shaken out weekly, your cushion cover washed, the scratcher replaced when it shreds, and the window ledge wiped of the dust she tracks in. Agree that the nook is not storage — coats and parcels dumped there will quietly evict her and the habit will move to your bed or desk instead. A well-kept dual-zone seat becomes the calm center of the home, good for your reading and her birdwatching alike. Give relatives you pick access to her profile via KinsLe Family Sharing, so chosen family members can open the profile of the cat whose fleece pad sits beside your reading cushion.