Hmmm I don't have a problem with an MLP brokeback mountain (I mean there's like a million lesbian MLP ships and fanfics, it's only fair)... but Braeburn and Big Mac are cousins; that's kinda um... incest
I mean I guess they might not be like cousin cousins, e.g. directly related to each other, but related through marriage or something, but I dunno about this lol. I would have picked two characters who were... well, explicitly not related. Big Mac and Braeburn might not be related, but we don't really know.