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Twilight Sparkle and Flash Sentry exchange a passionate kiss at the moment of their separation

Book 1, Chapter 4, pp. 71

The moon at last rose to the zenith, and the gateway in the base of the horse statue began to shimmer.  Twilight could feel her two-legged body melting away, and her old, familiar body soon replaced it.

She turned her head aside and tried to hide her face behind a wing.  "Oh, Flash," she said, her voice husky, "I didn't want you to see me like this—"

His hands touched her wing and gently lowered it.  "But why?" he asked.  "You're beautiful."  He gazed into her eyes, and once again she felt her heart flutter.

"Doesn't it bother you that I'm a pony?" she asked in a husky voice.

He began gently to rub her ears.  "Twilight," he said, "I want you to listen closely to what I am about to say."

"Yes?" she whispered huskily.

He laid his hands on her cheeks, placed his face close to hers, and said, "I love you.  I love you more than I have ever loved anything, or anyone.  What you are or where you are does not matter to me, and I swear to you, even if I have to rip apart the very fabric of the universe, I will find you again.  Even the flames of hell itself could not keep you from me, because my love for you burns hotter still."

"Oh, Flash," she husked.  But then, with aching tenderness, he kissed her trembling muzzle.  They totally made out, human and pony, like it was G1 all over again.

At last, he drew back from her, but her pouty lips still longed for his touch, and her full bosom heaved, except she didn't have a bosom now because she was a horse.  I sort of forgot that part.

"Oh, Flash," she husked huskily in a husky voice that husked, "you are, like, soooo totally hawt."