Excitement and joy are marvelous things, but as any pony knows, they eventually die away. Whether it is a memory of a terrible experience, knowledge of an outcome, or just the simple realization that they don't have as much reason to be excited as they thought they did. The latter is what happened to Twilight as she began to realize what the problem with this recent development was: Rainbow was a filly.
Sure, adult her was sort of likely to maybe have had a possible crush on Twilight, but right now, Rainbow had no memory of ever even befriending Twilight.
She stopped squealing and bouncing around the room rather suddenly as the realization hit her. She turned to face Fluttershy, suddenly appearing close to tears. Fluttershy immediately stepped forward to calm Twilight, giving her a hug and guiding her to the couch.
"Twilight? What's wrong?" Of course, she already knew, but it would probably seem a little arrogant to act like she did.
"I still don't have a chance with her. *sniff* It's always something with her. Either she's too busy to listen when I try to say something, or she's not there when I have the guts to say it outright, or she accidentally intimidates me into being afraid to say it, or -now- she's too young! Why can't I ever have a chance with this mare?"
"Oh, Twilight. You know you have a chance with her!" Fluttershy attempted.
"Not now? What if I can't fix this? What if I do fix it, but she's mad at me for this? What i-"
"Twilight. Calm down. This isn't that bad. I'm sure you can fix this, because you always do. And she won't be mad at you. Even the princess has accidents, right?" Fluttershy smiled gently and comfortingly at Twilight as she spoke.
"Well, yeah..." Twilight agreed.
"Then Rainbow'll understand that you didn't mean to turn her into a filly."
Twilight took a deep breath, letting it out in a deep sigh. "Yeah, I guess so..."
"Twilight. It's going to be fine. You'll just have to take care of her until you figure out how to fix her. That won't be hard, right?"
Twilight laughed softly before answering. "No. I just need to invent a whole new spell. That'll be easy!" She said with a humorous sarcasm.
"Oh... Um-"
"Don't worry, Fluttershy. It won't be easy, but I'm sure I can fix this." Twilight got up from the couch, brushing away the drying tears with a hoof before walking over to the guest room. She peaked in to see Rainbow and Spike having a fun wrestling match. Actually, it seemed more like Rainbow was having fun, giggling happily, and Spike was fighting for dear life, sweating and breathing rapidly. Smiling gently, Twilight walked back over to the couch.
"I think I can handle it 'til then."
"Okay, Rainbow, bedtime."
"Awww! C'mon Twilight! Please?" Rainbow begged, putting on a pair of puppy-dog eyes that normally would've convinced Twilight of anything, but she had put on a steel resolve and decided that two hours past the original bed time was enough for the first night.
"No, Rainbow. It's bedtime, and that's final."
"Aw, alright." The little filly trudged over to her bed and laid down quietly, pouting a little bit. Twilight walked over and flipped off the lights. "Um... Are- w-..." Twilight looked at her curiously.
"Yes?" she asked.
"C-could you please tuck me in?" Rainbow asked in a small voice and a shy face.
"Sure." Twilight replied, chuckling quietly to herself. She walked over and helped Rainbow into the bed comforters, and all the other little whatnots that a OCD adoptive mother would tend to on her first time tucking a foal in. She turned to leave, but Rainbow spoke up again.
"A-aren't you gonna kiss me goodnight?" Twilight froze. She'd dreamed of hearing Rainbow say things like that. Literally. But now? Now Rainbow was a filly and Twilight was completely and utterly afraid to do anything like that. Hay, so far today she'd barely touched the little filly at all.
And yet, here they were, Rainbow asking her to kiss her good night, which was actually sort of odd considering that Twilight had told her before that they were friends. Twilight didn't even feel like a motherly figure to her, nor did she think that Rainbow found her to be one right now. In an attempt to avoid the situation, Twilight voiced this last thought.
"I-I'm not your mom or anything-"
"I know, but I just-" Rainbow hesitated a moment. "I just kinda feel like... you should kiss me... or something..." She looked down at her lap, shyness still evident on all her features.
'Feel like you should kiss me' ran through Twilight's head repeatedly for a moment before she fully comprehended all the implications of this innocent foal's request. Even when she finally realized what this could mean, she still stared at Rainbow, completely frozen in place from shock.
"Twilight?" Rainbow asked, looking up a little confusedly. Twilight quickly shook her head to clear it.
"Uh, sorry... Y-yeah, sure. I uh- I get it." She walked over carefully, as though the floor was constructed with egg shells, and gave Rainbow a fast peck on the forehead. "Goodnight, Rainbow," she said through heavily heated cheeks.
"Thanks. Goodnight, Twilight."
"What a long day..." Twilight was relaxing in her bed after all the work she'd been through today. She heard rumbling outside, probably from the thunder storm Twilight had been told was scheduled for tonight. It took longer to roll in than she was told it would, but she was sure that was due to reduced horsepower tonight. After all, the 'Best Flier In Equestria' was only a filly and wasn't working tonight.
There was a bright flash of light that lit up the room, then a loud, thunderous (go figure) crack that shook her bed. She found herself wide awake suddenly. There was a sound of scampering hooves from the staircase, then a rapid tap on the door. Twilight used her magic to open the door, finding a frightened, rainbow-maned filly standing in the doorway.
"T-Twilight, the thunder's scaring me... C-can I sleep with you tonight?" Oh dear Celestia. She should say no, right? There was nothing good that could come of th-
"Sure." Oh... Dear...