Runaway Heart (слэш)

Tony and Loki are best friends, roommates in boarding school and now in university, partners in crime and cohorts in shenanigans. At fourteen they made a pact-- finish college, get rich, and if they aren't married at 30, they'd get married to each other. It's a foolproof plan.
Loki has been silently pining after their best friend for years now, and after waiting and waiting for Tony to notice, they finally decide to move on and find happily ever after with a wedding to someone else.
Faced with Loki's upcoming nuptials, Tony realizes that he has ALWAYS loved his best friend and that waiting till 30 to get married suddenly seems like a terrible idea.
But it's the day of the wedding and Loki is walking down the aisle.
Has Tony missed his chance, or will he try one last time to give Loki his heart before running away for good?