I love my Izumos but they get no special care or need special care. Remember that historically urushi finish was used for everyday utilitarian objects, plates and boxes and tables and cups and bowls. It's very forgiving and meant to be used as an everyday object. Direct sunlight will hasten fading but again, it was used on statues and armor and scabbards and buildings for centuries.
And don't worry about letting others try your new fountain pen but do use it as a teaching moment, explain how to use it first, then allow them to try it but keep the cap in your hands.