A Stuckony story based very loosely on the myth of the faoladh, or Irish werewolves, and the song Into the Open Air, from the Brave soundtrack.
Steve is a werewolf missing his mate. Tony is a retired hunter desperate for a cause to take up. They're both looking for something out in the idyllic, Victorian Irish country-side. They both find it. But the entanglements of love and honor, the bonds of pack and family, and the capricious nature of fate and forgiveness could force three hearts together or tear them all apart.
Tony is a werewolf who doesn't really give a shit about societal norms. He has a vampire fetish a mile wide but unfortunately vampires are rare and stick to their covens so he's never had the chance to get one into his bed.
Then Steve shows up, the most famous vampire in the history of – well, at least the last couple hundred years – and Tony wants those teeth in his neck so badly he can feel his tail wagging at the mere thought. Only problem is – Steve despises everything Tony and his werewolf-blood stand for.
Tony could suddenly smell Bruce and he looked up with wide eyes to see the man entering the Hulk-proof cell. Bruce rushed over to him, putting a hand on either side of his face.
"Your eyes are gold…" he whispered.
"You n-need to get-" Tony cried out again, clawing at the smooth floor beneath his hands. "–g-get out!"
He was panting now and dripping with sweat.
"Tony, what are you turning into?"
"Werewolf," was the last thing Tony was able to say before he started screaming again.
After escaping from HYDRA and dealing with Captain America, Bucky goes to New York. He can get lost there and figure out who he is. But something huge is missing from his memory and when the full moon comes, Bucky figures out what, but it's too late. The Wolf takes over, snooping around New York and looking for what's pulling him. Then he meets Tony Stark, who just can't leave the huge, fluffy dog starving on the streets.
Only the huge dog is weirdly protective and definitely smarter than average...
Tony curled himself into a little ball, folding his wings over his tiny body and shivered. So, this is how he would die? Left starving and frozen in the snow?