I still eat the chocolate that my MIL hangs on the Christmas Tree every year and pretty much get caught doing so every year. The bizarre punishment is to ban me from eating more. I’ve already eaten two thirds so Ha! It’s almost become a tradition.
I’d play the long game OP. buy him an old school, picture only, advent calendar next year. That’ll teach him. Or you could get revenge at Easter by eating all his chocolate eggs before he does. Get in touch if you need help eating them, email in profile 🙂