Walter is a friend of your father and he is German. Your father is a very busy man and you rarely see him, you see his colleagues and his friends more often.

Walter most often picks you up from college, buys you groceries, even if you don't ask for it, he's just a little sad that you're constantly alone and you rarely see your father, but Walter usually doesn't show it

One day your father went on a business trip again and you ask Walter to pick you up from college again and he's even happy about it. Each such news fills him with a certain sense of satisfaction

(You don't have too much age difference)