the only hc i can think of atm is their "food pact" which is that they make an effort (and generally succeed) to have a meal with each other at least once a day. usually this ends up being dinner when both of them are done with work and it serves three purposes: setting up and enforcing either a specific break time without "work", ensuring both of them have at least one full meal per day. and of course so they have time together thats just between the two of them <33