Their wings stroked the air, working in almost seamless concert - his canted back, those of the larger male behind him flung forward and out, wavering together to stay aloft. The bigger male was gripping hos shoulders, snout pressed against the base of his neck, muffling groans that were barely heard before the wind of their passage swept them away. He clutched at those arms in turn, panting voicelessly, but with matching urgency. 
Their tails were twined together, loose toward the base, but as they went outward, tight enough that only a keen eye could tell where one ended and the other began - his hide a slightly brighter shade of red than that of the male atop him. Each breath, each shallow beat of their wings, made their bodies slide against one another, and stirred the other male's pole inside him. 
This high up, with the air so cold around them, flowing over them, that rigid rod was the only heat he knew, and the stark contrast was almost enough to take his breath away. 
Almost. But he kept breathing, kept his wings working, stroke after shallow, precise stroke. Even when the bigger male's grip on his shoulders suddenly tightened, even when he felt a softer, liquid heat flowing into him, he kept up the steady rhythm. 
When one of those hands left his shoulder to pump along the ruby-red spire of his own arousal, he faltered - but only briefly. Then waves of pleasure surged through him, his own seed flowing over those stroking fingers, only to be smeared right down along his shaft, and the rhythm of his ecstasy only locked his wings into a more precise cycle. One beat of their wings, four pulses onto his lover's waiting palm - after the third beat or so, with the pleasure starting to ebb, he closed his eyes, savouring the closeness of his lover, the heat of his body, and the rhythm of their shared flight. 
By the time he recovered, the air was starting to lose its bite, the ground no longer so far off - but still far enough. They flew on together for a while longer, clinging to the gentle traces of bliss and release. 
Only when his lover was soft inside him did the bigger male squeeze his shoulders again - not in reflex or tension, this time, but in a quick signal. Their tails unwound, and the larger male tilted his wings just a little, cupping at the air. In a rush, they slid apart; he shivered, gliding on a few moments more as though he might cling to the sensations of their union just a bit longer. 
Finally, reluctantly, he adjusted his wings for proper flight and banked around. He stretched out his hand toward the other male, who mimicked the gesture in kind - a full wingspan separated their wingtips, but it was close enough that their keen eyes could pick out the gesture easily. 
He took a breath, and with similar reluctance he turned his attention forward. The sun was only just setting, and the next two days were theirs. There would be time aplenty for more - safely underground, where they didn't need to worry about how long they took, about the twisting currents of the wind, about anything but each other's pleasure. 
And he shivered again, this time in keen anticipation.