In face, please link to our stories. It actually helps HeroicStories gain more visitors, more traffic, and generally better ratings in the search engines.
For the record: in general you never need to ask to link to any web page. If a page is public it’s understood that you can publish its URL and links using that URL from elsewhere, and there is no ethical or legal reason not to. (Caveat: I am not a lawyer :-). ).
What you can not do without asking first is to copy or republish one of our stories elsewhere. See May I re-publish this HeroicStories story? for more information on that.
But … absolutely … link away!