What's your favorite storyline in Love Actually?

After about 20 years of re-watching every Christmas, I have come to the conclusion that my favorite storyline is the couple who meets while they're working as stand-ins for a sex scene in a movie. They have such a great connection, and of course, it's so funny that they are naked and simulating sex while casually chatting about traffic, etc. I just found them really sweet.

Which storyline or couple is your favorite?