"Well I guess I'll go first," Jack says examining the shelves. "How about this?" He says gripping a flask of clear brown liquid.
"W-what is it?" You manage to stammer out to your friend. He ignores you and chugs to whole thing down. Instantly he starts moaning loudly, beads of sweat rolling down his face. You try to walk over to him, but stop out of fear, small black hairs cover his arm, his body slowly grows larger and more muscular, face slowly pushing out into a muzzle. His clothes tear off his body, revealing a new wiry-haired tail swishing back and forth. He kick off his shoes to reveal large hooves. You finally manage to take in what remains of your friend, a massive, black, anthro stallion, staring at you blinking. "So?" He asks voice completely different than before."How do I look," he asks, while flexing his new massive muscles. You try to respond but you find yourself attracted to him, more specifically his big, black horse cock. Oozing with precum, you find yourself infatuated with the thick testosterone filling the air. Jack spots you staring and licking your lips. "Don't worry, I don't mind," he motions toward his thick equine organ. You step closer, ready to suck him dry, before he stops you, placing his massive hand on your head. "All you gotta do is drink this." He shoves a flask in your hand full of clear liquid. The label "slave potion," is tapped on crudely along the side. You hesitate for a moment, deep in thought and...