Get your friend and your friends boyfriend and Zach and go on a double date to a nice dancing place (do any of them line dance/two step/couple dance at all?).

Slow dance comes up... friend and friends b/f go out onto the floor. SO DO YOU TWO

or go out somewhere nice to eat with people mentioned above, one of the other two go to the bathroom, the other one has 'an important call' on his/her cell and takes it outside, boom you two are alone...

try to find something to break the silence