The life of Spike in a world where his friends are all fifteen feet tall and perpetually horny.

It began, as it always did, with a knock.

Spike startled, dropping the pile of books he’d been carrying in the process. “One minute!” he called out. He grumbled to himself as he knelt down to pick up a particularly weighty tome. “Can’t they see the closed sign?”

Another knock, this time so hard that the very wells shook. Spike blinked. Oh. So it was going to be one of those nights. In that case, there was hardly any point in trying to neaten the library any way.

“Coming!” he said, doing a quick one-eighty toward the front door. His shaft was already starting to push out of its sheath, his balls emerging from his crotch alongside it. He made sure to put on his biggest, most welcoming grin - but knowing what was coming still put a blush on his cheeks and a quiver in his step all the same.

Who would it be? he wondered. Rainbow Dash? Rarity? He reached down and groped himself as he held Rarity’s image in his mind. His claws curled over his hardening member, which was already a good six inches long and still growing. Maybe tonight would be his lucky -

Something big slammed into the door and sent it crashing to the floor. Spike’s pupils dilated a little, and his breath came a little bit faster. A big, orange face was peeking through the door, big green eyes seemingly larger than life.

“Well, howdy, Spike,” Applejack said, leaning down to be able to see through the door. “I’m a mite sorry ‘bout the door - guess I was a little overeager, is all.”

“O-oh!” Spike quickly put his claws behind his back - which, conveniently, let his package hang out on display, bobbing quietly in the night. “No worries! It’s fine. Do you want me to come out, or - “

“Reckon I’ll come inside tonight,” Applejack said. Before Spike could protest, AJ had already forced her enormous head through the door. She had to press the rest of her body against the ground to even have a hope of fitting the rest of her inside, and as much as she tried, the top of her rump still scraped along the top of the door.

It would have been a miracle if she’d been able to fit inside without causing any damage. As it was, Spike could only watch in horror - and unspeakable arousal - as Applejack’s fifteen-foot frame crashed through the front door. The entire doorway splintered and cracked around her gigantic, muscled body. Her flanks might have gotten stuck in the door had she not been more than strong enough to force them through. As it was, the entire tree groaned and shook as Applejack finally made it all the way through, its entire front side now replaced with an Applejack-sized hole.

“Whoa, nelly,” Applejack said. She glanced sheepishly back at the hole. “Guess I’m a little bigger than I was last week.”

“A little,” Spike said, gulping. When he was a younger dragon, he’d had dreams of being an enormous dragon like the one from the Everfree Forest, towering above the entirety of Ponyville. When his birthday had swung around last year, he’d had the opportunity to live out that future in full - if only for a day. Looking up at an Applejack more than two times his size, though, made that fantasy seem an impossible distance away.

“Least it looks like you’re more’n ready for me,” Applejack said, noting Spike’s erection with a raised eyebrow. Being a dragon, he was more than a little “gifted” in that department; even Big Mac had let out a long whistle when he’d let eyes on Spike’s thirty-inch tool.

Two and a half feet was more than enough for any normal pony, especially with a mega-sized, cum-filled nutsack to match. But Applejack wasn’t just a normal pony - and what made it worse was that she had needs.

“H-heh,” Spike said. He scratched at his spines and took an involuntary step back. He couldn’t help it - she was just so big. His erection more than agreed, throbbing bigger and harder with each inch that AJ towered over him. “Guess so.”

“Then let’s go, sugarcube.” Before he knew it, Applejack had tackled Spike to the ground. Just a single one of her enormous hooves was enough to keep him pressed to the floor. He groaned and squirmed as her giant, wet tongue lapped at his growing member, apparently even eager than he was to see it reach its full size.

“Mmf,” he grunted, his hips thrusting upward as a steady stream of precum started leaking from his tip. “Oh, Celestia, AJ. That feels - mmff.”

Applejack paused. “You like that, sugarcube?”

Incredibly. “Y-yes.”

She smirked. “Then how ‘bout this?” she asked. She twirled her enormous tongue around his equally enormous cock, and then - without blinking an eye - took the entire thing into her mouth.

Spike shivered in pleasure. He was almost six feet tall, and had a package that would put any pony to shame. But Applejack was so much bigger than that, so much more powerful, and it made him feel absolutely tiny to be next to this mountain of muscle and size.

“Oh, are we starting already?”

Spike’s eyes shot open as the ground shook beneath him. Oh, gosh.

Twilight.