What happens is that Eva falls asleep on me, usually after tiring herself out with a screaming fit, so I'm reluctant to wake her by moving; Edith then senses her opportunity and jams herself onto the available remaining lap space. Thus I am pinned down for hours at a time.
I have taken to arranging everything I could possibly want within reach of the sofa, but there is always something that I've left *just* slightly too far away. This morning it was my water bottle, and that was really quite tantalising.
Oh, also I spoke too soon yesterday about my small victory. Shortly after writing that Eva turned into a human milk fountain and covered me, herself and the floor in milk. She managed to get both the front AND the back of my khakis, I have no idea how she did that.