Honestly I love at the beginning how it gives you the illusion of free will and name choice only to shoot it down with coffee
The coffee is a way of getting affection with the boys.
Use 'Dave' to get +1 affection with everyone. You can use any of the friends names to get unique dialogue and +1 affection with that person (names must be capitalised).
Theres some others just for dialogue like 'Timber' and 'Chase', i dont know them all