Tia's Troubles

"Mmmmnnn... Ohhhhhhhh..."

Droplets of milk trickled down the curve of each breast as jets of cream squirted out of each nipple, while poor Twilight convulsed and shuddered. It felt like her tits were overfilled and couldn't empty themselves fast enough, with the backlog creating a pressure build-up that felt both painful and deeply pleasurable. She resorted to enclosing one over-inflated teat in both hands and squeezing it between them, like pumping a bellows. She gritted her teeth as the milk shot out at an even higher velocity, nearly reaching the ceiling 10 feet above her bed. But still the pressure was unbearable! There was only one thing she could do.

"Ohhhh gods! Spike! Spiiiiiike!"

Spike, who had been crashed out on his bed for the best part of the day, slowly opened his eyes, yawned, stretched, ruffled his shock of mint-green hair, then sat up.

"Ugh. Coming, Twilight!"

He had noticed strange changes in Twilight's body. Gradual, but definitely there. So gradual that Twilight didn't notice until Spike mentioned it. Suddenly it became obvious why her clothes had been getting tighter. What they didn't know was this was all happening because of Twilight's recent transformation into a princess. She was inheriting the hyper-fertility shared by all Equestrian royalty which Twilight had only recently discovered through literary investigation. When the growth didn't show any signs of stopping she got worried and wrote to Celestia.

Spike tried to feel sympathetic but it was hard to ignore how incredibly sexy Twilight was becoming, a girl that wasn't exactly unattractive to begin with. Being a young adult of 21 and having been hit very hard by puberty, all he could think when he looked at the super-curvy Twilight was "Must. Not. Get. Hard."

It was difficult for the well-endowed Spike, who had always been 'big' for his age, to hide his feelings for Twilight, but now when his 12-inch hard on was almost constantly bulging against his pants around her it was becoming embarrassing. Twilight made sure that he never saw her looking, but lately she was feeling severely over-sexed. What she really wanted was to have her pussy stuffed with that thick pillar of meat but she was far too timid to even hint at her desires. Despite her shyness her libido was rising faster and faster, it was only a matter of time before she lost all inhibitions and pounced on her assistant: all twelve inches of him.

Spike muttered to himself as he shuffled groggily down the corridor to Twilight's room.

Jeez, what's the idea getting me up in the middle of the day? This better be important.

"I deserve a lie-in tomorrow Twilight, 11AM on a Sunday? This is unbearable! What's-"

As he walked through the doorway he stopped and stared at Twilight's fidgeting form splayed out on the bed. Her toes were curling and uncurling, her head was rolling on the pillow, and her little hands were pumping her over-inflated tits. She managed to notice Spike through her haze of lust and her magenta eyes lit up.

"Ah, there you are my little..."

She noticed the growing bulge in Spike's underwear.

"...big assistant. I need you, and I'm not taking no for an answer."

Spike pulled off his shirt and threw it away.

"Neither am I!"

Nearly stumbling in his mad rush to reach Twilight, he landed on the foot of the bed.

"Woah there big boy, wait a minute."

"I'm not sure I can..."

He looked down and Twilight followed his gaze. There was a growing damp spot forming on the tip of his length as pre began to ooze out of his semi-boned dick. Twilight giggled and pressed her foot against Spike's crotch. He gasped and moaned simultaneously as her cute little toes pressed against his sensitive flesh.

"We don't want your little friend going off too soon, do we?"

"Ungff... mmnn.. No, Twilight."

"Good boy."

She lifted her foot off and Spike's junk re-filled the available space, straining against his boxers.

"I'm pretty sensitive up here at the moment, so try and show a little restraint, Spike."

He eyed her taut globes longingly, entranced by their size and majesty, and responded after dragging his eyes away from them and moving his gaze up to Twilight's stunning visage, which he judged was just about as fantastic as her chest. And seeing as Spike was a hormonal young man with a keen interest in breasts like many males of his age, that was saying something. From her well-defined jawline to her cute button nose and sparkling purple eyes, she oozed sex appeal. And of course, being Twilight, she was completely unaware.

"Okay Twilight. I'll be careful. What's going on with you anyway? I didn't wanna say anything but you've... changed?"

She had. Ever since she had been crowned a Princess and Celestia's hand had touched hers she had felt something. A sense of mental clarity, of enlightenment, but also in the deepest, darkest recesses of her mind a sexual hunger. The seed of her hyper-fertility had been planted, and now, like with Celestia, it was awakening.

"It's hard to say exactly, but I've been in touch with Celestia and it must be something to do with my transformation into a princess. It seems the changes weren't just to my role in Equestria. It involves some sort of innate power of fertility that goes right back to the earliest days of the history of these lands. The Equestrian royal family isn't just there to look pretty, we have powers too. The power to provide and maintain life in Equestria through reproduction. It's not really much use these days but it's still a part of us and we can't exactly switch it off. The best we can do is to stay chaste and let it lie dormant. There's no telling what we'd become if we unleashed these powers. Although I do have some idea..." She looked down at her expanding bust. "...And I must admit, I'd like to find out."

Spike's mind, clouded with desire, struggled to take in Twilight's speech. He was clearly thinking about other things, which became obvious to Twilight when the tip of his penis began poking over the waistband of his boxers. He looked up, smiling timidly and blushing.

"Oh, Spike. Let's get you out of those undies."

As she pulled the boxers down, the head got caught in the bunched-up fabric. When she peeled the fabric off Spike's length it sprang back up, flicking flecks of pre across her face. She reeled back laughing and removed each little blob with her finger before licking her digit clean.

"Oo, somebody tastes good. I can't wait to sample the real thing."

She cradled his large balls in one hand while caressing his length with the other. Spike could only clench his fists in his lap and savour the sensation of Twilight's soft, velvety hands massaging his member. Beads of pre began rolling down the stiff pole as the head flared.

"I'd better stop before you blow, we haven't even started yet!"

Twilight laid back and gestured for Spike to come over. He crawled over to her and gently laid in top of her, hands wrapped around her upper body. His dick wedged itself between her meaty thighs and they locked lips, eyes closed and tongues dancing. Twilight broke the kiss.

"I almost forgot why I brought you in here. The pressure in my tits is getting unbearable and I need a big, strong man to help me..."

Spike sat up while Twilight played with his manhood. His eyes fell once more upon Twilight's expansive bosom.

"You want me to get the milk out?"

What a way with words he has.

"Yes Spike."

He cupped her left breast and found he couldn't being his hands together, this really was a big boob. He latched onto the fat nipple and started sucking hard while groping the breast flesh. Twilight's mouth opened in a silent scream as she experienced a sensory overload. Spike was taken by surprise as a burst of thick cream filled his mouth, bulging out his cheeks. He swallowed quickly and his mouth was filled again and again. He kept this up until he felt his stomach filling and slowly released his grip on the monster boob. He needed to save some room for the milk in the other one!

He pulled off and the suction broke with an audible *pop*. Without wasting any time he cradled the other boob, locked his lips over the nipple and sucked. Again, Twilight's eyes rolled up into her head as she held Spike's head in her hands and gritted her teeth. After half a dozen mouthfuls Spike was full and he let the nipple go, rolling off of Twilight and laying next to her.

"Thank you Spike, I thought my tits were going to burst! Looks like you still need to get off though."

Spike's dick was indeed still hard, but it looked a little turgid, as if it was trying to grow. What neither of them realised was the milk Spike had just ingested was no ordinary milk, but was laced with Twilight's unique genetic make-up which passed her powers of hyper-fertility onto the recipient of her emissions, in this case Spike, and would turn him into a being of pleasure and sex just like the Princesses. Being male, naturally it effected him differently. His testicles and penis would see the lion's share of the changes, and the increase in hormones would build muscle mass and increase libido, all with the purpose of turning him into a reproduction machine.

Spike was paralysed with pleasure as the changes overcame him. Twilight tried to rouse him.

"Spike? Are you okay? Woah..."

She sat, wide-eyed, as his cock began to lurch and swell. She timidly extended her arm and reached out with her hand. Just as her fingertip met his length, it blossomed upwards and outwards. She withdrew her hand and gasped as Spike's cock fattened and lengthened, inch after inch adding onto its height and girth. As it grew, his balls, apparently eager to catch up, swelled and churned, filling the space between his legs and pushing them apart. His muscles gradually became more well-defined; chiselled abs and sizeable pecs emerged from a previously nondescript torso and tennis ball-sized biceps rose from his enlarging arms.

His cock's growth began to slow as it reached the two foot mark, and his balls lurched one more time, just reaching the size of volleyballs. Now seven feet tall and hung like an oversized horse, Twilight wanted to take him for a test ride.

Spike gradually came down from his sudden sexual high. He opened his eyes and found a towering pillar of cock rising above him. He didn't realise it was his until he reached out and grasped it. As soon as his fingers met the surface of his enormous dick he was flooded with waves of pleasure. He tried to question all this; the hows, whys and whens, but all queries evacuated his mind when Twilight gripped his cock and squeezed. He cried out as a rope of pre spurted from his broad cockhead, sailed back down and splattered against Twilight's arm. Twilight wiped off the cum and stared at the gooey substance adhering to her fingers. Her sharp mind began racing.

My milk contained something that made Spike grow... a lot. Perhaps whatever he has in his balls now will have the same effect on me. Maybe then I'll be able to fit that huge dick in me.

Eager to investigate her theory, she wasted no time in kneeling in front of Spike and engulfing his meat column with her tits. She pressed her huge globes of flesh together and began sliding them up and down the area of his length that she could reach. There wasn't any need for lube as his cock was already slick with the seemingly endless supply of pre that spurted out every few seconds.

"Looks like I made you big and strong with my milk, Spike. Maybe your cum will make be bigger too, then I can get this beast inside me."

Spike tried to say "yes" but all he managed was a guttural moan as Twilight began pistoning her arms up and down and massaging his ultra-sensitive cock meat with her soft, doughy fun bags. Before long the veins along its length began to flare up and the head began to swell. He was about to blow!

Twilight sat up and, with a little difficulty, managed to get his whole head in her mouth. With a few double-fisted pumps, Spike went over the edge.

A thick rope of spooge blasted into her mouth, almost making her gag as it splashed against the back of her throat. She regained her composure and swallowed just in time for the next shot which once again filled her mouth to the brim. Spike was groaning loudly and holding his cock at the base as all the muscles in his groin contracted, sending buckets of spunk out of his balls, up his length, between Twilight's tits and into her mouth.

After ten mouthfuls Spike was still going strong and and Twilight pulled herself off, gasping for air. His cock continued to convulse, and the next rope rocketed out of his tip and into the air, coming back down all over Twilight's face as she looked up to watch it. Unable to resist, Spike pushed his rock-hard dick downwards and aimed it at Twilight's surprised, sticky face and let her have another blast of cum, and another, and another. After nearly twenty ropes he was done, a little bit of spunk still oozing out of the tip and rolling down his length. Twilight was plastered with jizz, most of it hitting her in the face or the upper chest. She smirked at Spike and began to wipe down her face with her arm. She scooped up a few handfuls of jizz and greedily swallowed it.

"Jeez, you really put out now. I need to clean myself off."

She stood up, rubbing her eyes, and turned. As her vision focused she noticed a tall figure standing in the shadows by the door.

"Goodness, who'd have thought my student was so good at giving head?"