Hello, The update will be released tomorrow.
You'll find the new quest direclty in your map, and afor the affinity, they will be unlocked, so you'll be able to increase it simply by playing with the new characters.
I know this is a late response, but after I updated the game I only get 2 text messages to respond to them with. "What can I do to pass the time?", and how do I enter the castle?". I see no "work option, etc.". I guess I'm confused about how exactly we interact more with the twins since it shows the 2 hearts, underwear and then the lock.