The boys taking advantage of their incorporeality to literally share the same space, anyone? Hugging so tightly it’s like they want to merge bodies and then they do.
The sofa doesn’t have room for both of them to lie down (doesn’t really have room for one of them, to be honest) but they just both lie down mostly overlapping, their bodies inside each other in a way no living humans can achieve, their unbeating hearts nestled against each other
Joining space with most of their bodies while their arms are flung about separately so that Edwin can hold a spellbook while Charles holds a magnifying glass and an enchanted candle over it and they can look at the book with their eyes at the exact same angle (the first time Crystal comes in and sees them merged into a “four-armed monster” she screams)
They did it a lot at first because it’s the only way they can feel warmth in any real sense; it’s not quite the same warmth as the living sense of temperature, as human thermoception, but sharing space with the thrumming spectral energy of another ghost is as close as they can get, and it helps, they learn after months of Charles shivering against cold that only he can feel, that isn’t real thermoception, either. They spent quite a lot of winter nights, the first few years, curled up inside each other, curled up against each others’ souls like a cat against warm laundry.