You can't help but stare as the huge Minotaur's sack pulses and swells once more with Bessie's serum. You've dodged the bullet for now, but it's clear that the female bovine 'taur could decide to turn you into a milking toy at a whim! Bessie's aweful milker suckles at both of you the whole time.
(Ssschlurrrp ... Ssschlurrrp ... Ssschlurrrp ... Ssschlurrrp...)
Now you can only watch in horror as the 12' tall Minotaur's ball-sack becomes taut and swollen with excess fluid from the injection. When you first got here, the creature's balls had already hung from his hips to his knees making the like bloated over-sized footballs. Then the angry cowtaur stabbed the minotaur's sack with another injection to swell his monstrous nuts to the size of watermelons bringing his daily output to fifty gallons. His bullish pride and source of his strength now over-grown and lying on the ground like some perverse State Fair produce as part of Bessie's parody of a dairy farm.
(Ssschlurrrp ... Ssschlurrrp ... Ssschlurrrp ... Ssschlurrrp...)
You've seen the cowtaur use her dick-milk man-dairy making solution twice by now. Like before when she turned your family jewels into the grotesque pair over-stuffing your sensitive sack to the size of a grapefruit. You knew the minotaur's huge black furred sack would swell up with the serum injection like a water balloon or one of those perverse scrotum infusions. The dull sensation of your sack pumped full of liquid pales in comparison to the first hand memory of the gut wrenching feeling as the cowtaur's perverse alchemy would start to soak into your precious parts, burning like fire as it makes a male's 'milk-makers' swell and grow. Every ounce of liquid fire causing your balls to burgeon full of more and more cum-making flesh, growing ever fatter, heavier, and massive like they're filling full of hot molten lead.
(Ssschlurrrp ... Ssschlurrrp ... Ssschlurrrp ... Ssschlurrrp...)
The intense full-body feverish sweating as your whole form begins metabolizing the infernal concoction that slowly fills your cum factories with more and more mass. The serum seemingly conjuring more male meat from out of nowhere, forcing your family jewels into piling on literal pounds of labyrinthine sperm-making tubes and coils within themselves. This feeling of them growing hot and heavy. More raw male mass stretching your sack taut from within, and pulling further and further to the ground with your own seed ready to be milked out, you know it well. You remember how recently Bessie turned your precious grapes into a pair of massive mangoes that are even now weighing at your thighs, fighting for space. Your dick hard as steel, drunk on your new supply of hormones fires off another load. "Wow is that twenty?" you think dimly as your prick never softens, as you can already feel another load building. You know all of this well, and deep down you're starting to love it.
(Ssschlurrrp ... Ssschlurrrp ... Ssschlurrrp ... Ssschlurrrp...)
It's part of why you goaded Bessie, a ballsy dare to see just how big she could make the Minotaur. A small part of you rooting to see how big she could make you. But something's wrong this time. Needle went in. The impossible serum went in too. Insane liquid filling the furry sack, and bathing the immense watermelons still firmly planted on the ground as it knocked the immense bull-man unconscious on his side. But you stare dumbfounded this time, there's no growth.
The cowtaur seems to notice your curiosity. "Come and look at our handiwork little Promethean." she purrs fiendishly as she draws your shackles from the wall, prodding you around to view the prostrate minotaur's rear. "Figured it was time for my back up plan for boosting the productivity of my worthless bull, all thanks to your prodding my lazy little calf." In the stretch of flesh between his sack and anus, is a line of dark red flesh made bare by the whatever serum Bessie used. Whatever it is, it's quivering and growing. The line becomes a deepening cleft. A growing revolting realization hits you, as you begin to recognize the distorting flesh as becoming something familiar, but partly feral and animal, not quite human. "No...it can--" She interrupts your thinking aloud. "Yes my lazy little male, my brother Aster here is gonna have a great big brand new juicy cow cunt." There's a sickening squelch as the minotaur's new hermaphroditic hole quivers open. The unconscious minotaur groans in his sleep as Bessie's thick fingers probe at his newly grown bovine cleft. "All those new heat hormones from his new bro-varies are gonna force his big dumb cum-makers to work overtime just to keep him mostly male. Can't wait to see how everything ramps up with a calf in him."