You were also unaware that Greg's girlfriend Naomi had come over to visit and that she was accosted by both Greg and Jack as she came through the door. You had no idea that her clothes were ripped off, that she was forced onto all fours and got fucked at both ends.
For Naomi, the double dose of equine cock was so powerful she was willingly deepthroating Jack the moment her gag reflex disappeared and came hard when she felt Greg's balls slapping her ass.
Her ass filled out into a large round mass of muscle that forced her legs into a bow shape, thus putting her cunt with its darkened and thickened lips on permanent display and held her gaping fuck-hole open for welcome intrusions. Her tits swelled and swelled, her areolas darkened and spread across the expanding flesh like spilt chocolate milk, and her nipples grew from pink eraser tips into ebony rods that scraped the floor in a way so electrifying that Naomi would now find any excuse to be on all fours.
Her face pushed out into an equine shape and her tongue thickened and elongated with it, enabling Naomi to lick Jack's musky balls while she deep-throated his magnificent cock. Her taste buds mutated and over-multiplied along the new surface to greatly enhance the pleasure of tasting a thick, meaty horse-cock and Naomi's twisting mind reveled in the perverted addiction that particular transformation would bring.
The two stallions whinnied as they unloaded into the willing slutmare. Naomi greedily swallowed every drop of the delicious cum from Jack's cock and instantly knew that Greg's cum would make her pregnant.
Naomi stood up.
"Mmmmm," she moaned, "You studs sure know how to show a woman a good time. Do you fuck the humanity out of all the women you meet or am I just a very lucky slut?" She stroked a hand along each of the two magnificent cocks responsible for her change.
"You are the first woman," boomed Jack's deepened voice.
"But not for long," added Greg with a sinister smile.
"Thats right," said Jack, "Before the night is through we'll have converted this entire dorm into a stable of beastly sex. All who enter will forever know the pleasure of equine cocks, and as the first slut you shall nurse their corruption from your blackened teats!"
The three of them whinnied and stamped their hooves with joy as you finished your last slice of pizza.