I have just about the same problem with my Shadow, a young male cat we got in November. He has decided the quilting room is his, especially my sewing chair. I finally took everything off the cabinets by the window and made his a really nice bed. But he likes my chair more than that bed. When I come in the room and want to sew, I have to love him for about 10 minutes and then take him to his bed. Some days he doesn't like it and will come over and bat at me over and over, wanting me to get out of his chair. I find that if I leave bobbins on the desk, he will knock them all over the room and the thread is quite a mess. I find the only thing I can do is actually lock him out of the room when I sew. And sometimes he throws a fit and hits the door over and over. Shadow likes to walk everywhere he wants to go, which is a problem, sometimes I worry about the hot iron. But I adore this silly cat.