The capture looks a little awkward but perhaps that's appropriate for the subject. Deinitely makes the viewer wonder who the photographer in realtion to these dudes.
I don't usually like comments or give them, but since candids are near and dear to my heart, I have decided to comment on every photo in this challenge.
It is hard for me to comment on this one. I find it hard to believe it is not contrived, and not because it is a good photo, but because of your proximity to the couple and how they seem to pretend you don't exist when I would find it hard to believe they wouldn't have noticed you. Also, the placements of their hands, although funny, seem almost posed. They are nearly the same distance and in the same position of each others butts. Seems a bit forced. I almost feel like they gave you a shot rather than you capturing one, whether you know them or not. It may fly as a candid, but something just seems too odd to me in order to vote it higher than a 4.