Jennifer arrived at Zach's place and after the usual catching up she finally returned to the question of his "costume". "Okay, Zach, honey, do you trust me?"
Zach nodded, "Of course I do, sweetheart! What does this have to do with my costume?"
Jennifer swallowed a bit worriedly and then continued, "When I ask the next question, you should respond with the word 'transform'... Zach, transform or dare?"
Knowing Jennifer's sense of humor, Zach didn't hesitate, "Transform."
Jennifer breathed a small sigh of relief, "I'm sorry, honey, this is all Kyle's fault: for your transformation you will be a were-cowtaur with full control of your transition from hunky quarterback to full dairy cowtaur. The only sign that you are a were-cowtaur when you are your quarterback self will be two rows of six nipples just above your crotch to remind you of your udder." Jennifer threw that last bit in for her own humor.
Zach laughed at her, "That was pretty funny Jennifer. Too bad that isn't really a costume."
Jennifer shrugged, "Kyle has required me to turn you into a cow, take photos of it, and milk you so that we can donate cow's milk to the Pancake breakfast. Unfortunately for you, this curse thing is real, and I'm really sorry, honey." She managed to maneuver a hand into his pants, and began rubbing his new nipples.
Zach's eyes widened, "What the--" He quickly had his pants and underwear off and was staring at the udder-nipples. As he stared at them he could feel them growing, and he could feel the part of his mind that made them grow. Soon Zach had a large udder hanging from his crotch. "This is really weird, Jennifer."
Jennifer already had the camera out and took a photograph, "Should I milk you, yet?"
Zach grunted, "This thing is too heavy like this--" Zach finally "let go" with the transformation and finally was standing on all fours, a full cow below the waist, and yet still mostly himself above the waist.
Jennifer pulled out a bucket and started milking her boyfriend the cowtaur. "It's a good thing I went to that barnyard summer camp all those years, or this might be really embarrassing for the both of us right now."
Zach was quiet, a far-off look on his face, and his tail was twitching in an almost pleased fashion.