After helping Pinkie Pie clean the remaining chocolate residue out of her fur, Spike climbed out of the tub, shortly after followed by Pinkie herself.

“Whew! That felt good!” said Pinkie Pie, shaking the water out of her fur.

Spike raised an eyebrow at her. “Don’t you use towels?” he wondered.

“I’m a pony! I don’t need to!” she replied, giving him a silly smile.
“I gotta go finish the party preparations!”

“Need help with anything?” Spike asked.

“Nope, I think I’ve got it covered.” she said, putting on a thoughtful expression, before looking back at Spike again. “You must be exhausted. Why don’t you take a nap while I get everything ready?”

Spike realized that he was rather tired, and if Pinkie didn’t need his help he didn’t really have anything to do anyway.
“Yeah, I guess that would be nice.” he said.

Pinkie Pie showed him to her bedroom.
“The bed’s over there!” she said, indicating the direction of the bed with her hoof.
“Make yourself at home.”

With that, she left, heading back to the kitchen.

Spike hopped onto the bed, threw himself down on the soft sheets, and quickly fell asleep.

---

A prod from a hoof awakened him.

“Wake up, sleepyhead! The party is about to start!” said Pinkie Pie, who was bouncing excitedly next to the bed.

He followed her downstairs to the main room, which had now been decorated with a large number of colorful balloons and streamers. She went into the kitchen again, leaving him alone to examine the room.

A large table had been set out, upon which a large bowl of punch, a tray of delicious looking cupcakes, potato chips and various other snacks had been arranged.

On the wall, a large sheet of paper with a crudely drawn pony on it had been nailed up, next to a box containing paper pony tails and board pins - everything needed to play Pinkie Pie’s favorite party game, “Pin the tail on the pony”.

In the middle of the room, there was a small table containing a record player and various records.

After looking around the room for a while, examining Pinkie Pie’s handiwork, Spike realized that his nap had made him rather thirsty and sauntered over to the punch bowl. He grabbed a glass from a nearby stack, ladled some punch into it and took a sip.

Swirling it around in his mouth, he evaluated its taste. He’d never tasted anything quite like it before - a tangy taste of strawberry and banana with just a hint of salt - but it was quite good. He chugged down the whole cup, filled another and was about to drink it, when a suspicion crept up on him.

“Hey, Pinkie, what’s this punch?” he shouted towards the kitchen door.

“I call it ‘Mystery Punch’!” she answered cheerfully, sticking her head out the kitchen door.

“I mean, what’s in it?” he asked.

“Oh, silly! If I told you that it wouldn’t be a mystery anymore, now would it?” she replied, grinning mischievously at him and adding “Let’s just say that the punch has been spiked in more than one way.”.
Her head disappeared back into the kitchen.

Spike shrugged, and downed the contents of the glass in one gulp.
He was about to sample the cupcakes, when he heard someone knocking on the front door.
Pinkie Pie reappeared from the kitchen door and opened the door, revealing Fluttershy and Rarity.

“May we come in?” asked Rarity politely.

“Of course! Make yourselves at home!” Pinkie replied cheerfully.

The two ponies greeted Spike with a nod, and Spike thought he could see a slight blush come over Fluttershy’s face. Rarity didn’t seem to have noticed, however, and soon they were busy drinking punch and conversing with each other about fashion and various other subjects that Spike deemed a bit too frilly to bother paying attention to.

A few minutes later, Twilight stepped through the door, wearing her simple yellow dress that Rarity had made for her last birthday.

She came over to Spike and greeted him, before levitating a cupcake off the tray and taking a bite of it.

“Mmm! Delicious cupcakes! Strawberry and banana-flavored with a hint of nuts!” she exclaimed, causing Spike to choke on his punch, spraying the front of Twilight’s dress.

“Sorry!” he quickly apologized, regaining his breath.

“Oh, don’t worry about it. I’m sure it’ll wash off.” said Twilight, looking down at her damp dress.

In the next ten minutes or so, the other guests arrived one after the other.

Rainbow Dash immediately made her way over to the record player. “Got any speed metal?” she wondered out loud, as she sifted through the records looking for something decent to put on.

---

A few hours later, the party was still going strong, and most of the guests were becoming rather inebriated, having helped themselves to plenty of the food and punch. Rainbow Dash was standing on her hind legs, headbanging and playing air guitar with her hooves as the record reached a particularly radical guitar solo, while Twilight was dancing badly, completely out of sync with the music.

Fluttershy brushed against Spike, moving unsteadily on her way to get more punch, apparently completely oblivious to the fact that she had an extra paper tail pinned to her flank.

Even Pinkie Pie herself was apparently getting quite blasted, and was giggling hysterically at Applejack’s ancient jokes, while Rarity looked on with an expression that said “I am not amused.”.

Suddenly, Spike felt something ramming into him, knocking him over and causing him to drop his glass so that it shattered against the floor, spilling its contents. He turned around to see Twilight shuffling her feet, with her eyes closed and her tongue sticking out, flailing her front hooves in front of her.

Upon realizing she had hit something, she opened her eyes, turned around and looked down at Spike, giggling. “Oopsh. Shorry Shpike!...hic!”
She unsteadily levitated over a new glass of punch, spilling punch all over the floor, and after taking a big sip, handed the glass over to Spike before resuming her cringe-inducing dance.

“Oh, Celestia, this is worse than I thought.” Spike thought to himself, taking a sip of the punch as he watched Twilight shamble around on the floor, knocking over Rainbow Dash and bucking Applejack’s hat off, causing Pinkie Pie to break into uncontrollable laughter, rolling on the floor.

He waited for the music to stop for a moment, before prodding Twilight’s flank and causing her to turn around. She tried to focus her vision on him for a moment, before giving up and letting her eyes slide back into a derp.

“Come on, Twilight, it's time to go home...” said Spike, grabbing the hem of her dress and pulling her towards the door. “...before anyone gets seriously hurt.” he thought to himself.

She mumbled something incoherent in a slightly annoyed tone, but did not resist as he led her outside.

---

As they entered the library, Spike was feeling the effects of the punch. Remembering what happened the last time, he had been trying not to drink too much - and it had sort of worked - at least he wasn’t quite as smashed as Twilight.

He eventually managed to get her up the stairs to the bedroom, and was on his way to his basket when he heard a loud thud behind him, and turned around to see Twilight sprawled on the floor, having tried to jump onto her bed and missed.

Letting out a deep sigh, he turned around and moved over to her, prodding her lightly in the flank.
“You okay?”

“I’m f.... fine.” she said, getting back on her wobbly legs.

Spike turned her towards the bed, and gave her flanks a push to get her onto the bed, but she refused to move, instead turning around to face him. Her face was a slightly reddish hue, either due to the alcohol or because she was blushing, and in her eyes, he spotted something he had become all too familiar with lately - lust.

“Twilight, what are you...?” he began, but stopped as Twilight leaned towards him, staring into his eyes.

“Hash anyone told you what a sh... shexy little dragon you are?” she slurred at him, and before he could answer, she had put her hoof around him, and pulled him to her, locking her mouth against his in a kiss. He could taste Pinkie Pie’s mystery punch on her tongue, as she pushed it into his mouth, wiggling it around playfully.

Spike was having the weirdest boner.
He had known Twilight all his life - she was like a combination of his best friend and sister - and he had never considered that she might have such feelings for him.
Well, he admitted to himself, remembering a few of his private moments in the bathroom, at least not most of the time.

He enjoyed the wet kiss, wondering for a moment where she could have learned to kiss like this, as she’d never had a stallionfriend as far as he knew. She must have read a book about it, he guessed.

After a while, she released him from her lips and started to climb unsteadily onto her bed as he stood there lost in thought. As she turned her back to him, he could see that a wet spot had formed on the plot-region of her dress, and he felt reasonably sure it wasn’t punch.

Having successfully made her way onto the bed, she turned around to face him again, a flirty if slightly unfocused look in her eyes.

“Come here Shpike...” she said, lying down on the bed and patting the sheets with her hoof, indicating for Spike to join her.

“I’m probably gonna regret this tomorrow...” Spike thought, as he climbed onto the bed.
He wasn’t at all sure if this was a good idea, but the alcohol had lowered his inhibitions and he was far too horny to resist the temptation.

“Take me...” said Twilight, patting the back of her dress.

Spike carefully lifted the dress, revealing her private parts, already dripping wet with arousal. He placed the tip of his cock against her moist furry slit, and started rubbing it up and down between her lips, coating it with her natural lubricant. It felt wonderful, and waves of pleasure spread through his body as he continued to rub against her, feeling the warmth of her body against his dick.

Feeling that he was sufficiently lubricated, he finally pushed it in all the way to the hilt, enjoying the warm feeling of her moist plot resting against his balls, and causing her to bite down on her pillow to stifle a loud moan.

He slipped his hands under her dress and started to caress her soft purple flanks, as he slowly began to slide his length in and out of her, enjoying the delightful sensation of her tight cunt massaging his cock and the sound of her muffled moans as she pressed her face into the pillow.

Continuing to thrust into her with increasing speed and power, he felt his arousal building up, jolts of delight coursing through his body with each thrust. He grabbed her soft purple tail and started tugging it, causing her to let out a muffled cry of delight through the pillow as her rump was lifted up slightly, causing Spike’s cock to rub even harder against her clitoris.

He could feel her entire body quivering with pleasure as he continued his thrusts, his left hand massaging her cutie mark while his right tugged at her tail. Listening to her muffled cries of passion, and sensing that she was close to coming, he increased his pace even more.
Finally, he felt her tight cunt clamping down on his cock and starting to convulse as she let out a loud scream of delight through the pillow.

With a sudden movement, she sprung upright, still in the middle of her orgasm, lifting him up with her. He grabbed on to her flanks with both hands just in time to stop himself from slipping out of her.

“Uh... Shpike! I think I’m gonna...” she exclaimed, her voice cracking up from her orgasm.
Her line was cut short as retched and started projectile vomiting into the pillow, while simultaneously soiling herself.

The sensation of her warm pee flowing down his cock as her tight cunt squeezed it set Spike off as well, despite his disgust at her puking, and he squeezed her flanks hard with his hands as he shot spurt after spurt into her, filling her up with his cum.

Her urine continued to flow down his balls, occasionally gushing out with extra force as she gagged, taking with it some of the cum and drenching her dress and the bed below.

When her regurgitation ceased, she dropped herself sideways down on the bed, away from the puke-covered pillow and lay there with her eyes closed, panting for a moment before falling asleep.

Exhausted, Spike cuddled up against her soft furry body, his dick still inside her, feeling her warmth against his scales, and soon he too drifted off to sleep.