I managed to salvage one couch cushion to sit on. The others have been confiscated by the boys. Yup. Plural. The boys are building a fort together, jumping on the cushions and otherwise being boys together. Its great to see them playing together (with a little mediation) and having a great time.
That last few weeks their relationship has really blossomed. William is coming into his own and asserts his independence by bonking Connor on the head. Connor is learning to treat him gently, sometimes. But they are able to play together now, instead of Connor complaining that William is bothering him.
In fact just this afternoon Connor got pretty mopey when William couldn't play with him outside.