Absolutely - best to go with the flow. Whatever makes them happy. Because that makes us happy as parents. The teenage years are so brief, but so supercharged with significance for them that it's so often hard for us to share, or even see sometimes. Any time there's a 'hey, let's do this together!' from their side ('their side' sounds wrong - but I guess you know what I mean), whatever 'this' is (within reason to some extent) I reckon that 'yes' is almost always the best answer.