Anything that lets them be together, really. To be in each other's presence. I can see Calix enjoying helping Lumen out in the medical department from time to time, although there may be times he has to remove himself due to his reputation built up back in Kazdel. Still, Lumen appreciates it nonetheless, and reassures Calix that he'll be fine. They'd for sure enjoy having walks together as well, as it gives them a good opportunity to catch up whenever they've gone without seeing each other for a bit.