food for thought
if you are duoing with someone for the missions and a random in a game asks if he can join the party too and you say "no", be warned that this decision draws some mission related consequences. i mean... you can't do baron if the game ends before that, can you?
[sg-ezreal]
so i suggest you be nice and say "yes!"
you should also keep in mind that breaking said promise will have an effect on the next group after you