More than a friend, more than a assistant

Celestia pondered for a bit and smiled, "Wait Spike, your birthday is tomorrow so how about you stay for the night here and return in time for your birthday party tomorrow, I'm sure everyone will be in for a big surprise."

Spike smiled and nodded, "Sure thing mom, I can't wait. For now, do you want to build a matress fort?"

Celestia chuckled and shook her head, "Oh Spike, I'm glad you are still a child at heart but once you return home, you must be ready and willing to learn how it is to be an adult."

Spike nodded and they went to Celestia's bedroom as the night began to take over, meanwhile Twilight was walking a bike back to the library. She smiled at the fact she was sure Spike would love it and that her best friend was going to be one year older and one year more with her. "Fourteen years together...I can clearly remember the day he hatched and how excited I was. He sure was a handful but the more I looked at him, the more I didn't mind...he's my little guy and I'll miss these times when he gets too old and leaves..." she stopped in front of the library and frowned, "No...I shouldn't think of such things, I should focus on enjoying the time I still have him here with me." She entered the library and her eyes went wide as she saw a mess of streamers and ballons littering the whole place, she then saw a pink blur pass her with a trail of confetti. "Pinkie! What are you doing?!"

Pinkie Pie immediately stopped and turned to look at her, "Twilight! Hi!! I'm thought I'd get a head start on setting up for tomorrow and let myself in! Now if you don't mind, I have two confetti cannons to load and cake mines to plant, parties are WAR!!" She ran off and Twilight wanted to say something but she just shook her head and took the bike into her private reading room. She got some wrapping paper she bought and began to use her magic to levitate the bike as she wrapped it up in paper, she smiled as she imagined Spike's reaction to it and how cute he'd look riding about the neighborhood.

She finished and set it down and heard Pinkie Pie say goodnight as she zoomed out of the library, Twilight didn't even get to say goodbye, much less ask where Pinkie Pie set up all her traps so she flew up to her room and sat there in silence. She looked at the clock and saw how late it was getting and had no word of Spike, she was sure he was still in Canterlot but she still couldn't help thinking he might be on the train back. A paper appeared before here with a poof and it had Princess Celestia's insignia on it, she opened it and read it:

Dear Twilight,

Spike is going to stay at the castle for the night and will return just in time for the surprise party I'm sure Pinkie Pie has cleverly planned out. This should give her and your friends plenty of time to be ready. He says Goodnight and that you shouldn't stay up late with your books. Goodnight my friend,

Signed, Celestia

Twilight smiled and nodded, she placed the letter on her bedside table and laid down. She was so excited for Spike tomorrow that she found it a bit hard to fall asleep but exhaustion eventually got a hold of her and she passed out. Morning came and she arose, she went to her bathroom and got undressed, she turned on her shower with hot water and stepped in. She sighed with relief and washed herself, as she took a loofa and washed her body she remembered what Spike said about her looking for a guy to go out with. She imagined a tall gentlemen-like guy who loved books and learning just as she did would be ideal, he would also know how to keep the library clean as well as cook or she would have a pigpen of a home and starve. She chuckled but as she began to wash her legs and hips, she blushed and also thought of what he would do with her in her shower, in her bed, even in her private reading room. She touched her womanhood with her hand and felt a dampness not caused by the shower, she was embarrassed that just thinking of an ideal guy for her was actually making her wet but she never really had a boyfriend and read so many romantic novels as well as erotic novels she stashed away that she could help but imagine so many hot and naughty situations.

She began to gently touch her precious flower more and moaned a bit, she was alone and no one was expected for a few hours so she thought if she was going to play with herself, the time was now. She placed on hand on her breast and gently knead it in her hand, she didn't like the fact she wasn't as busty as Rarity or Fluttershy but she was more than Rainbow Dash and Pinkie Pie. As she rubbed her lower lips with her hand and teased her nipple with her fingers, she imagined her ideal guy was right in front of her, asking her to do all these naughty things to herself and she complied. Her moans began to grow louder as two fingers began to move into her pussy and she tugged on her nipple which set small jolt of pleasure through her. She panted as she leaned against her shower wall and moved her hands over her body, her mind became fuzzy with the sense of pleasure and she wanted more. She moved her fingers even deeper and pressed against her inner folds while she took both nipples into one hand and tugged on them both. Her knees shook with weakness as her orgasm was well on it's way but Twilight wanted much more to finish herself off. She finally pushed her fingers as deep as they could till she found her favorite spot and attacked it with her finger tips as she moaned loudly, she moved her fingers in and out all the while she struggled to stay up till finally, she achieved her goal.

With a loud cry, she came on her hand and panted as she struggled to stay up, hot wetness dripped down her inner thigh and legs. She looked down and saw her soaked hand, she blushed at how viscus it was and brought it closer to her mouth. She never saw such an amount and was curious as she rode her afterglow, she stuck her tongue out and lightly tasted her cum. She was surprised by the naughty taste and the fact it wasn't too bad but she didn't want to do it again lest it became a habit. She finished showering and stepped out, she dried herself and put on her clothes, since Spike was gone she had to go out for breakfast lest she set something else on fire.

She walked out into town and was greeted by it's citizens who still treated her as a princess even though she really didn't care for the formalities and special treatment. She reached a café Rarity showed her a while back and walked in to get a breakfast sandwich with some black coffee, unlike her friends, she loved coffee just black. She took a seat at a small table as she waited for her order and saw someone waving at her, she saw Rarity making her way to her with a coffee cup in hand, "Darling! So nice to see you! What draws the lady out this morning? and where is my Spikey Wikey?"

Twilight smiled, "Hey Rarity, Spike left to Canterlot yesterday and stayed overnight but he'll be back today just in time for the party. Since he isn't here, I have to go elsewhere to find nourishment." A waiter comes by and places Twilight's order down and walks off, "What are you up to so early Rarity? Doesn't your shop open in three hours?"

"Well, yes but I am taking today off. I have been swamped with the fashion week orders from Canterlot and finally finished yesterday so I'm giving myself a well deserved break and thought I'd stop by your place to help with the party."

Twilight shook her head, "There is no need, Pinkie Pie ransacked my house and set up the whole thing already. She mentioned she laid traps for Spike so I am kinda avoiding my house till a hour before the party"

Rarity looked a bit worried, "I do hope that girl hasn't set up anything that will hurt him, well, since we are both free, let's head to my boutique and chat a bit before we need to head to the library. Applejack said she was going to power through her chores to come by too, Pinkie Pie will no doubt already be at your home if she isn't already, Fluttershy said she and Discord were going to have tea before the party so she might run late and Rainbow Dash said she was going to wait above till he showed up aka she's asleep and doesn't want to be bothered till the party starts."

Twilight chuckled at Rarity's unamusemet with Pinkie Pie and Rainbow Dash, once Twilight finished breakfast, the left to the boutique and gossiped about royalty till Applejack came by. They were both surprised to see that Applejack actually had a dress on, it was plain but the fact it was a certifiable dress was shocking and their reaction only made Applejack feel uncomfortable, "Will y'all quit gawkin' at me? Ah know it's a dress but ah thought ah should look nice for Spike's birthday, the little fella means a lot ya know."

Rarity and Twilight smiled and let her in, she also joined into their gossip but also added in gossip in town. Between their wonderings of how Princess Celestia keeps a slim figure even though she eats a lot of cake and why Lyra is so obsessed with ponies, time flew by quickly. They left the boutique and headed to the library, by the time they got there Pinkie and Dash were outside giggling, Rarity looked at them cautiously, "I take it you two jokesters have something in store for Spikey?"

Dash laughed and nodded, "Oh, he's not gonna suspect a thing! You see, Pinkie added some-" She was interrupted by Pinkie Pie as she covered Dash's mouth with her hand.

"You'll spoil the surprise silly! They'll see it when he gets here and tries to head into his room, hehehe..." A wicked smirk crossed Pinkie's face and Twilight actually felt worried but assured herself Pinkie wouldn't intentionally hurt Spike. They all made their way inside and a few minutes later, Fluttershy entered too. They talked amongst themselves quietly as the time drew closer to when he should appear and then there was a knock on the door.

"Hello? Anyone in there? It's kinda cold out here."

Everyone inside was confused by the voice for they couldn't recognize it and the front of the library had no window and the door had no peephole. Twilight approached the door and opened it, "Oh, I'm sorry. We were waiting for a friend...wait..." She looked closely at the guy in front of her and noticed his dark green hair, his cocky grin, his emerald eyes, and his purple dress shirt, "S-s-spike?!"

He grinned and walked in, he hugged Twilight and waved to everyone else as they all gawked at him in amazement and confusion.

"I-is that r-really Spike?" asked Fluttershy, she stepped back from the group and looked him over as a small blush grew on her face.

Applejack got closer to him and walked around him as he still hugged Twilight, she smiled, "Well hot dang, it is Spike! Y'all are grown up now!"

Dash looked at him puzzled, "Hey Twilight, did you do this? Not that I'm complaining but...it's kinda weird to see your friend grow overnight..."

Pinkie Pie screamed and ran upstairs, "Ahh!! My trap wasn't made for tall people, oh no!" There was dead silence and then a loud explosion, she came back down with smoke coming from her hair and covered in soot, "Avoid your room for a bit, I opened a window to vent out the smoke."

Rarity never took her eyes off of Spike, she had mixed emotions. She felt sad that she no longer could spend time with the little boy who always followed her around and helped her so much. She felt confused as to how it's even possible for him to have aged so much  overnight, she tried to observe and recognize his facial features and they reminded her of someone around her age which seemed too impossible to believe. She also felt happy, she didn't know why but the fact he was now just as old as her made her feel hope for something.

Spike looked back at her and smiled which made Rarity blush but she didn't mind showing it, all the while Twilight unconsciously felt Spike up. His now larger back, the muscles were more noticeable and she could feel him breathing. She felt his large, strong arms hold her close and lightly caress her back. He slightly towered over her and he rested his chin on her shoulder, she felt safe.

All the girls crowded around him and hugged him too, they moved towards the kitchen to have the cake while Rarity and Twilight stayed behind, "He really is grown up now...my Spikey Wikey is now just Spike..."

Twilight nodded and looked down, "I wonder how things are going to be now..."