There's this one reoccurring scenario where I just imagine Shadesbit in, and that's piling up on a bed or a couch like they're cats. They could be watching something together, they could be gaming, maybe they sleep if no one's breathing/snoring was an issue, but what matters is that they're comfortable in this pile. Could be considered a nest too, cuz they drag a bunch of blankets and pillows together.

I haven't really thought of anything too complicated beyond that tbh, unless helping each other out when one or more of the s/os are on their lows and they need some encouragement or a hand with tasks, but that's expected in a relationship.