Entirely for as little or as much as Sephiroth was used to the sands and shores of Costa del Sol, it would not compare to those within Spira. Nor the wind or breeze. But maybe that was perhaps due to how he at current associated Midgar with his past. However, this isn't to say he'd forgotten. No matter how much he ought to have wished for it. As Yuna sang for Sephiroth he could not completely grapple with the surging emotions he had felt. An expression not quiet made of sadness, but instead warmth reaches within his eyes as he watched her and listens to her voice carry the harmony, sound within which she'd belt over. He wasn't quite miles away, but he was very present? How would he be expected to otherwise?
The melody began to strength this time his usually little next to unreadable expression forms an imperceptible smile. A swell of joy, and perhaps maybe a hint of nostalgia swept over the warrior as similarly as though he'd foregone an undercurrent sweeping and washing him over. Those such tides were not those of abyss, but those of yearning and adoration. For what he is to mentally add or deduct while remaining attentive, she appeared to have allowed herself to become lost within the tune. As the pacing and rhythm changed, he wondered if she noticed how he must have appeared or made her own assumptions of what he must've melt. If she were to have caught the swordsman off guard then his bravado would reattempt to rebuild.
And inevitably, he'd have failed. Once the song was done, he was very surprised. It was not him feigning. It was genuinely pleasure and mild shock. "You would...sing for me?" He questions, though clearly she had been awaiting his verdict.