Someone said :
That is more than just "local".
Make sure you balance the value of the friendship, with the possible outcomes.
Is it worth it?
If so, don't let it be a surprise to the guy who might feel used or disrespected.
I am not telling you to ask him for permission, but maybe to express your interest in his sister in a manner that gives him a chance to express his opinion, and maybe even prepare the ground for you if your intentions are noble.
If your intentions are only transient, then pass your way without a second look back.
So in hindsight, things are kind of returning to normal.
Although i asked my friend's permission, things are now a bit awkward, but i'm sure that will pass in time in a few years,worst case scenario
. I'm a tiny bit burnt by the experience.
Given the way things happened i was powerless to resist though.
I think i won't shop too local in the future.