Not a sofa

Caspar is not allowed to sit on our sofa. Or any chair. Or our bed.
But a swing seat is none of the previous, is it?
Caspar saw D. lying on the swing. He did not hesitate a moment, but climbed onto it too, and then made it himself comfortable.
Of course D. found it cozy too.
Nevertheless, he had to get of the swing anyway, we can't start to allow that (he will just grow too big, and won't probably know the difference between sofa and swing).