Coworkers birthday

It's my coworkers birthday. We both work a 4:00am-8:00am shift. So anything sugary isn't really an option. He is older (could be my dad) and he lets me talk to him about my problems sometimes and he's going through the same thing. There's nothing at all sexual or romantic in anyway.

Anyway, I text him to ask what energy drink he gets and he said "no cause you're doing a birthday thing". All I'm doing is getting a card and his drink in the morning. Maybe stop and get a breakfast burrito. Is he expecting too much? Should I do more?