I particularly recommend elfin's stories, highlighting the 'For Keeps' series. These are about the three-way relationship between Michael Jardine, Robbie Ross, and Jackie Reid. There aren't enough f/m/m stories out there, and not only is elfin working in a sub-genre I like, for a show I like, but I think her writing style is excellent, and her characterisation on the button.
There are also some nice screen-caps which she has collected here. My only caveat is that, as with so many people, you have to see Michael, Robbie and Jackie in character and in action to really appreciate how good they are.