He cannot be made to sit in that cushion because he says his back is a bit “dippy” and for decades no one has ever asked what he’s meant by “dippy” because we’ve pretty much have known what he’s meant. Twitchy, achy. Impinging in on him in some way.
But we notice he does sit on other cushions. There are the ones on the window seat that he is perfectly fine with. Although we are not, because he tends to twist his whole torso and throws one leg up over the remainder of the window seat. And he twists his neck toward the back yard, to get a view of the roses.
This stresses the rest of us out. For we are sure this will only make his ‘dippy’ back Dippier.