As soon as Rainbow Dash was out of the library, the weather assaulted her. Heavy drops of freezing rain pounded the pegasus pony in a torrent that drenched her nearly instantly. The wind whipped at her, and she dug her hooves into the mud to keep herself from being blown backward. The world was consumed by a flash as a brilliant jagged lance struck the lightning rod of a home just a few dozen yards from her. The accompanying thunder was deafening, but the light revealed Twilight Sparkle not too far ahead of her, standing calmly in the rain, facing back toward the library. Dash shouted at the unicorn, but if Twilight heard, she gave no sign, not that Dash would have been able to see it in the dark or hear it over the cacophony of wind and water. Unwilling to risk taking to the air for such a short walk, the pegasus fought forward on hoof, intending to give that madmare Twilight a piece of her mind for getting them both drenched for what appeared to be no reason.
Dash made slow but steady progress forward until a white flash of lightning revealed that she was just a few feet from Twilight. The unicorn's horn glowed a brilliant purple for a few seconds and then winked out; with it, the light seemed to take sound, vision, and feeling. Rainbow Dash could no longer feel the rain, hear the wind, or see anything. The impression didn't last long; a silent bolt of lightning revealed rainwater flowing feet above the ponies' heads, cascading silently over the surface of an invisible dome. Twilight was the first to break the sudden silence, her voice barely a whisper, "Why did you follow me out here, Dash?"
A flash lit the world; Twilight had sounded angry in the library, but it seemed to Dash that the fire had gone out of her. She just looked sad, her gaze fixed firmly on the mud, and for an instant Dash felt sorry for her. When the darkness returned, and Dash's anger quickly followed, and the pegasus snapped at her friend, "I wasn't going to let you wander in a dangerous storm, Twilight. What were you thinking? You could have been hurt!"
The unicorn's horn began to glow, its purple light providing a dim illumination, enough to show that her expression had gone blank. "I can handle it, Dash. Clearly," she said, the last word tinged with sarcasm. Rainbow Dash noticed that while she was dripping, soaked to the bone from a momentary exposure to the storm, her unicorn friend was dry as a bone. Dash silently cursed magic as an unseen force stripped the water from her coat. As soon as Dash was dry, the purple hornlight winked out.
The pegasus was happier dry, but wasn't about to let her friend off the hook. "What's your deal tonight, Twilight? You've been acting strange and saying some really weird stuff. It's been getting more and more confusing, and this tops it all. I thought you were smart enough to come in out of the rain, but I guess I was wrong," Dash said, pleased at her own wit.
A flash lit their little bubble; Twilight's gaze had returned to her hooves. "I needed to think," she said.
Dash scoffed, "You can't think in the library?"
"Not with you there!" The unicorn shouted.
Rainbow Dash felt like she should have been offended by the implications of that. She may not have been the most brilliant pony around, but she certainly didn't make anypony around her dumber. Still, she gave her friend the benefit of the doubt and asked, "What do I have to do with you thinking?"
Twilight was silent for a few moments. "...You distract me. I want to tell you something, but I just can't bring myself to. When I try, I just get scared. Knowing you're there, knowing I could get it over with for better or worse with just a few words, it's maddening."
Dash sighed, exasperated, "So tell me."
"It's not that easy, Dash. I wish it were," Twilight replied.
"You have something to say, you have a mouth. I don't see what isn't easy." Some part of Dash really wanted to know what her friend was hiding; she felt like there had been so many hints, but she just couldn't put together the whole picture.
Lightning struck nearby, and its light showed that Twilight Sparkle was staring at Rainbow Dash with an intensity that the pegasus had rarely seen from anypony. Silence hung heavy in the air, the raging fury of the storm inaudible though Twilight's magic barrier. A minute of impatient waiting later, Dash was ready to speak again, but Twilight broke the quiet before she knew what to say. Water sloshed as the unicorn shifted her weight and spoke, "Dash, has anypony ever had a crush on you?"
"I don't know. Maybe?" Dash was caught off guard by the question.
Twilight's voice was quiet, "...Well, one does now."
"Who is it?"
A bright flash revealed that Twilight had planted one of her hooves firmly on her own face. The unicorn murmured to herself, and Dash could barely hear the words over her own breath, "Ugh. You know what? Forget subtlety. Just like in the bog. A brave pony like her."
"A brave pony like who?" Dash asked, as Twilight's horn began to glow, "What bog? What do you mean...."
Dash was struck speechless as Twilight leapt forward, wrapping her hooves around the pegasus' neck. The light from the horn died, and Dash's eyes widened in the darkness as she felt Twilight's lips upon her own, moving softly. Too shocked to react, the pegasus found herself beginning to enjoy the moment as she breathed in the clean air of freshly fallen rain, the scent made all the better accompanied by the subtle aroma of Twilight. The pegasus found that her heart was beating quickly and that she was suddenly very short of breath.
Dash's lips parted slightly as she gasped, and Twilight's tongue made its way between them. The pegasus found herself moaning appreciatively, and the last thought on her mind was 'Mares, huh? I could get used to this....' before even that faded. The storm was forgotten while Twilight held her.
As they kissed.
In the rain.