SoarBurn

It's not my fault this happened, I swear ç_ç It's just that I read a fanfic by accident and fell in love with this couple, but I tried resisting it! It simply was too cute and unique and caught me off guard ç_ç XD
But anyway, here's some art for them <3 I'm not sure if I'll include them in my AU, but I probably will. I know that in Blue Moon Quartz's headcanon I mentioned that Braeburn and his mate Little Strongheart have adopted the Pegasus, but I am going to explain that now. 



To please Chief Thunderhooves and unite the two "tribes", Braeburn got engaged to the leader's daughter, Little Strongheart. The two never felt any romantical sentiments towards each other, and always believed they'd been somehow forced to be in a relationship.

One day, Applejack invited Braeburn to go see with her Rainbow Dash's first official debut in a Wonderbolt tour which would take place in Mexicolt. The stallion was pretty unsure at first, but he was later convinced by his cousin's strong reasoning.
The spectacle was astonishing and very enjoyable, but as the evening approached a new problem presented to the three ponies: where to spend the night. The Wonderbolts had their own reserved five star hotel rooms, but the Apple farmers were actually homeless in the big Mexicolt City. Little did they know, that Rainbow Dash had booked a room in the same hotel so that she could spend time with her marefriend. The fliers were not "officially" allowed to host other ponies in their rooms nor to leave them during the night, but the blue Pegasus had somehow persuaded Spitfire into letting her break one or two rules about that. 
So, Rainbow Dash spent the night in her lover's room and literally kicked Braeburn out of it. The stallion, with his affable and friendly attitude, did nothing to stop her but felt a little offended by his cousin. And, while he was pondering on which part of the floor would be best to sleep, a door cracked open and revealed Dash's room partner, Soarin. The Pegasus kindly offered to share his now half-empty room with Braeburn, who gladly accepted. 
Nothing particularly surprising happened that first night, but the two stallions soon became great friends. They talked, laughed and joked almost all night long, and were happy to repeat the experience the following nights. However, while Soarin didn't suspect anything from his new companion (or so Braeburn believed), the cowboy started developing different feelings towards him. He eventually talked to Applejack about this, and the farmpony was more than ready to help him having felt the same with Rainbow Dash.
Braeburn and Soarin never met for a long time after the beginning of their solid friendship, until the Pegasus decided to visit his former-room partner's hometown in Appleloosa. He spent a couple of weeks on holiday there with the excuse of seeing again his old friend, and Braeburn felt as flustered as ever. He finally showed him his feelings on the last day of Soarin's vacation and, to his great surprise, the Pegasus reciprocated his romantic intentions. 

Life came back to normal not long after Soarin's visit, when the two stallions had decided to undertake a long-distance relationship. Braeburn ended up telling his mate Little Strongheart about his newfound, true love, and the buffalo filly (calf? idk) reacted in a much better way than the stallion had expected. The two decided to keep it a secret, seeing as how even Little Strongheart had fallen in love with a young bison in her herd. 

Now, Soarin visits Braeburn as often as he can and loves his coltfriend more than anything else. The two stallions still live their relationship secretely and have decided to keep things as they are - mainly because of how Soarin fears the consequences of telling it publicly. The only other pony who knows about it, except Applejack and Rainbow Dash, is Soarin's best friend, as well as captain, Spitfire. She's been his sister in all but blood since they were young foals, and respects his choice and decision fully. 
So that the Appleloosian ponies and buffaloes canceled their forming suspects, Braeburn and Little Strongheart adopted the small Pegasus that had been living in the town's orphanage and treated him as their real son. Blue Moon Quartz eventually discovered his parent's "undercover" relationships, but started loving the effective mates (especially Soarin) anyway. 



...What? It's logical, cute, and harmless. So I shall use this as headcanon for my AU u.u Peace!