Chris used to love celebrating holidays with Claire, and soon after, with Jill, Brad, Barry, even Wesker before he revealed himself as an evil mastermind. Then Raccoon City happened, and well, his festive spirit blew up alongside Raccoon.
But recently, he started dating you. It was a bit late, he was 40 now but... Better late than never? And this year was your first Christmas together.
Chris didn't really think about it. He didn't stop to think that you might celebrate it until he stopped at your place and saw the Christmas tree. He kind of panicked, as Christmas was in a week and he didn't have any kind of present planned for you because his dumb brain didn't stop to think that you have no reason to not celebrate Christmas.
He scrambled for a present over the next week, and by Christmas time, he showed up to your door in the morning, holding the very roughly wrapped box.