We have this
headcanon about them not being one of these super touchy-feely couples. They’re more into little details and little gestures. And if you want to catch these moments you have to pay attention.

“So these… are the accounts for the Pelopponese?”
“Yes.”
“And this sigil is for Aunt Hestia, isn’t it? This is her region.”
“That would be correct.”
“I can see why you’re so good at this.”
In which Persephone sits on the lord of the dead for laughs and general annoying, then actually gets interested and turns to be good at the family business.
I love when they go from sitting at opposite ends of the sofa to moving closer when they’re talking to people.