My husband is Japanese and I'm American. Every year we rotate between American and Japanese-style Valentine's. With Japanese style, the woman gives the man chocolates, which he reciprocates on White Day a month later.
Usually, I bring up Valentine's Day a few weeks in advance and we discuss how we will do it that year. We often can't remember what we did last year, so we have to discuss it. This year, to let him make his own decisions, I bought him chocolate and I let him deal with whether he wants to do it on his own.
Three days before Valentine's Day, he asks me which way we are doing it this year. I say it's up to him. He seems to remember doing it American style last year, so he wants to do Japanese style this year. I say okay.