Twilight stepped through the mirror gateway and felt the swirling of the portal. She also felt the changing of her body, getting taller, her hooves turning into hands and feet, and her teats moving to her chest and expanding. Like last time, Spike went with her through the portal. She arrived in the alternate world and looked around, shivering a bit at the brisk weather.
"It's much colder than last time. Must be close to winter." She said matter-of-factly as she looked around. She rubbed her hands together to try to get some warmth and then rubbed them against her arms when she froze: She couldn't feel any cloth! She stood up and looked down at herself, seeing what she feared: She was naked! She quickly covered herself, not knowing if this world had any nudity laws, and quickly went to look for cover as Spike snickered.
"Oh, where can I hide and get clothes!" As Twilight entered the school, she saw something that both shocked and reassured her. Everyone was naked for some reason, so she uncovered herself and tried to blend in. No one gave her a second glance as she passed them, though she tried to keep her eyes on faces, instead of down lower. "This is so strange! Last time I was here, everyone was wearing clothes! What changed?"
She decided to spend the day not worrying about it, though she couldn't help looking at a couple boys' parts, especially when they so brazenly showed off. 'They're much different from ponies. No sheaths. She hadn't noticed, but the cold air outside had made her nipples erect. She also noticed patches of hair around the crotches, that didn't seem to serve much purpose. 'Weird.' As she continued to look at others, she noticed some were partially erect or further along, and she quickly averted her eyes. 'Bad Twilight! You shouldn't be looking! Still, it's like the school became a nudist convention!'
At the end of the day, she went to her usual place to sleep in the school, no longer worried about not fitting in. She got her bed of books ready and laid down on it as the sun set, falling into an uneasy sleep. She woke up in the middle of the night from a strange dream, and couldn't get back to sleep. She figured she was too pent up from seeing all the boys showing off, and needed some relief, so she got up and walked to a corner of the library. She didn't want to ruin any books, after all. After checking to make sure there was no one around, she got to work, immediately sliding a hand down to her crotch and teased herself, stifling a moan so she wasn't caught. She was sure sex on the premises was against school policy.
She could already feel herself getting wet as she continued teasing herself, using her free hand to massage her breast. She slipped a finger inside and slowly pumped, and she couldn't stifle a moan this time as she fingered herself. She continued fingering herself, and slid a second finger in. She couldn't stifle the moans that she produced as she slid her fingers in and out. As she flexed her fingers, the tips brushed against a spot at the top of her vagina that sent an incredible burst of pleasure through her and nearly made her cum right there. She didn't hear anyone coming to investigate the noises so she continued, brushing against the spot again as she fingered herself, bringing herself even closer to orgasm. She pressed the heel of her hand against her clit, and nearly yelped at the intense feelings. She continued exploring her body, doing various things to it, like twisting her nipple, to see how she reacted.
She eventually came, her vaginal muscles trying to milk her fingers for semen they couldn't produce and she laid back as she rode out her orgasm, panting when it subsided. Her fingers were wet and sticky as she carefully slid them out and looked at them, the fluid on them glistening in the limited light. She hoped she hadn't squirted, since even back home, she sometimes sprayed from an orgasm. She didn't have the energy to get up, so decided to sleep where she lay. If she got in trouble for it, she'd deal with it tomorrow.
Twilight shifted onto her side as she thought she heard someone calling her. She figured it was Spike, trying to wake her up. The calling persisted, and Twilight awoke, not as a human, but a pony, lying in her bed in the library. There was a wet spot in the sheets, indicating a wet dream.
'That was one freaky dream! But why did I have it?' *She looked around her room and saw her friends around her bed, each one looking worried.
"Spahk thought you were havin' a nightmare, the way you were shiftin' and moanin', but Ah think it was somethin' else you were dreamin', based on that spot there. Better change those sheets and get cleaned b'fore Spahk comes back." Applejack said, smiling knowingly at Twilight. Twilight move the sheets and went to get up, before Rainbow let out a chuckle.
"That must have been one good dream you were having. You made quite the mess downstairs, Twilight!" She said through her chuckles. Twilight looked confused for a bit before looking down, and seeing that she was, indeed, quite wet. Her face turned bright red and brought her sheets back over herself.
"Come now, Twilight. It's nothing to be ashamed about. I'm sure we've all done it at least once." Rarity reassured her as she coaxed Twilight out of bed. "Now, you really must get cleaned before your fur gets matted. We'll worry about changing your sheets." Twilight nodded and trotted to the bathroom to get washed up before Spike saw her. She figured he was making breakfast. She stepped into her bath and turned it on. She hadn't realized before now, but her wings were fully flaired, and they felt stiff as she tried to wash them. As she finished, she was able to fold them again as the cold water she used calmed her down. As she dried herself off, she figured it was going to be just one of those days.
