"Ohhh, fuck, what was that! That hur- Oh......" Mike trailed off as he felt a tingling run through his dick. A sinister looking red and black feathered dart was bloodlessly embedded in his draft-horse sheath. Shira wondered what was in that dart, when she noticed that it didn't look like any of her darts. It must have been some surprise that Ty had left in there. Mike tried to look at his dick, to see what was happening. A sinister whisper plays in Shira's head, Ty using his dungeon master powers to speak directly into her brain. " This oughta be good. That dart was coated with concentrated succubae venom. Part of how they seduce their victims is to 'fatten' them up."
Sure enough despite his wild prancing, a glowing unholy corruption is arcing across Mike's penis like a smoky slow motion lightning bolts. His molted pink and black genitals seem to throb with unearthly pink and purple light. "Woah Shira, it feels so gooood..." says Mike as he flops to the ground and rolls onto his immense Clydesdale back.
Ty continues, "Succubae are sex demons, and they like to use their venom to get their victims really riled up and too big to unload in any mortal lover." Assisted by gravity, Mike's centaur schlong flops flat against his wide equine belly slathering pre all over, as his feathered hooves delight in the air. The red glow seems to throb and intensify in-tune with his immense draft horse heart. With every beat, the immense mare mounter creeps ever longer across the centaur's lower torso, growing a dark red as it slowly swells. "My dick...it..it's growing...feels like getting a hard on...ohhh FUCK YES!" The flared head flexing and flaring like mid cum-shot, but nothing erupts as the engorging stallion rod flails and slaps back down with a meaty thwack. "F-f-fuck S-Shira, I'm gonna be the biggest centaur ever!" Mike exclaims.
Shira, remembers when he was still Dustin. When the game started he and Ty watched Mike excuse himself to go "relieve" himself after becoming a centaur. Within seconds of going out of line of sight, Mike had contorted his human half around under his belly. The memory of Mike's vulgar grin as the immense draft horse dick was freed from it's sheath burned into Dustin's memory. "Ty promised me a maxed out horse package. Now how's this thing work? Fucking dungeon master, better not have cheated me out of that extra +6 to my 12 + 5d6! Oh fuck yeah Ty! All the ladies gonna want a horsie ride! Fuck...I'll have to be careful when I take a leak!" Mike had exclaimed. Sure enough the first time out of it's sheath Mike's new centaur rod was thicker than a mans arm. At a whopping forty inches, and well beyond his races normal statistics, the grapefruit sized head threatened to drag on the ground when flaccid. Now, enhanced and engorged on succubae poison, Mike's draft horse half threatened a girth equal to a human thigh, and the glans of his now dinner-plate sized flare was beginning to brush up against the inside of his front legs!
Ty's gloating continues in Shira's head. "Remember pony-boy here insisted on being bigger than the max result on his centaur racial description statistics with that huge block and tackle. He already started off as way bigger than any centaur should be. Look it's spreading now." The incontrovertible words of Dungeon Master Ty ring true, slowly the unholy venom is spreading from Mike's sheath and into his huge stallion nuts. Tainted by sinister succubae poison, every pulse of his immense Clydesdale heart soon begins to inflate his equine balls like balloons. Each of his coconut-sized foal-maker seemingly made to defy gravity as they begin to stretch and strain his smooth and nearly-hairless sack skyward. "Oh f...fuck, Shira it's making my balls bigger too!" Mike cheers, as he revels in his growth. His stallion shaft grown long enough to be reached by the tips of his human fingers. Mike begs, "Shira, you gotta...ufff...feel this. Uhhh...please...touch it." as every beat of the centaur's heart pumps the quivering equine pillar closer to a full four feet of immensity. Taut flared head slowly creeping further toward his human belly.
Aghast, Shira mutters through her grimace "Ty, what the hell? Poor Mike, he'll have to swing his legs around his own nuts just to walk!" as she reaches out to place a hand on the centaur sack that seems to be rapidly running out of slack for the still expanding, now volleyball-sized testes. "Mmm just like that... Shira" Mike nickers as the slight pressure from Shira triggers another climax free growth-gasm. "Oh fuuuck!" He pants. Copious pre-cum pouring out of the ever growing centaur like a faucet, while Mike's eyes roll to white in pleasure. Ty telepathically retorts "Don't blame me, that dart was made for disabling dragons and giants. You're the one that threw it at him! That dart had the full venom of a half-dozen succubae and distilled to five times normal succubus concentration. Besides I warned him! I told him that cheating the random rolls in character creation would have consequences. I balanced it by ruling that being this big would make his cock a pretty big target. Getting nailed right in the fuck-stick counts as a critical hit, and crits double poison effects too. Forget about how he's gonna walk, he's gonna be more cock than horse soon."