You and Zeke get up after getting zapped by the machine, and find that your clothes have disappeared, which made you cover yourself. "Jeez, (Your Name)," Zeke says. "I know it's embarrassing to be naked in a public place, but not when someone you know is naked as well. Just uncover yourself, and why do I feel erect?"
You look down at Zeke, and then notice that his penis was growing, until the shaft changed, his ball-sack expanded, and the length was longer. "You might want to look down," you say, which catches his eye.
"Holy shit," Zeke comments. "I knew my dick was long, but not this long."
"Yeah, no wonder you can't get girls," you phrase
"You’re one to talk," Zeke says. "And by the way, that's a nice pink spot you’re growing on top of your privates."
"Wait, what?" you ask, and begin notice a pink lump popping out from under your stomach.
As you stare at the pink lump, you feel that your own penis was shrinking, while the lump was growing. Your penis then shrivels up back into your body, leaving nothing but a cow's pussy, and the pink lump grows bigger, and sprouts teats long enough for milking. "I HAVE AN UDDER," you shout panicking.
"Relax, you should be use to this by now," Zeke comments.
"Shut the fuck up," you say. "You know damn well that I'm not, and wait is this a tail?" You turn, and find that you've sprouted a long black and white cow tail, with a blonde tail tip at the end. You then find, that white and black fur sprouts from your legs, while your butt crack puckers, and your pussy moves to be where a cow’s is.
You then turn to Zeke, and find that he has grown brown hair, and his tail had a tip that matched his hair color. As you continue to change, you see that the fur on you grows down to your feet, in which the toes fuse together, and become a pair of back hooves. Next your arm, chest, and facial hair begins to fall off, while your hair grows, and turns to the same color as your tail tip. Next your feel your face tingling, as it softens slightly and makes you feel like you’ve lost a little definition. "Why this," you say, as your voice becomes slightly high pitched, but you get distracted as you feel an almost-unnoticeable weight on your chest. You look down to see that your toned abs and chest are a little less defined, with a new but very thing layer of fat under your skin, and figure the da,e thing must have happened to your face. You feel that your muscles are the same size as before, just with a little extra padding over them now.
You turn back at Zeke, and found that he has grown a pair of long bull horns and he has gained muscles. Lastly to complete both of your transformations, second pairs of legs grow through your waist, and then land of the floor, readjusting to your back, which causes your nipples to get hard and remind you of your cock as a few spurts of something white leak from them and you lactate through your udder, while Zeke ejaculates. You and Zeke have turned into Cow-Centaurs.