Daniel has been doing a lot of reading during his furlough. He only has a little over two weeks left in Cyprus, and decided he would re-read some of Adrian Plass's brilliant books.
He was chuckling aloud (as you do) while reading 'The Sacred Diary of Adrian Plass Aged 37 3/4' when Tessie decided to sit on him.
Unlike the other cats, she doesn't usually want lots of attention. She doesn't want to be stroked all the time. She doesn't even try and sit on books to stop people reading.
In fact, it looked very much as if she was reading along and enjoying it as much as Dan was: