"Dude! You gotta get over here! You're not gonna believe this!"
It was Joe, Dan's next door neighbor and a soccer teammate of Ian's. "You might be surprised what I believe..." Ian said. "I'm at Dan's, so I'll be right over. Leave your back door unlocked."
Ian stretched is arms and all four of his magnificent legs as he rolled off the bed. "Dan, can I borrow a pair of shorts? It seems I don't have enough pant legs."
"Sure... but I need to tell you something."
"Can it wait? Joe wants us to come over."
So, after cutting a hole in the rear of his old shorts, he slipped them on his front legs, and a pair of Dan's shorts on his back legs and hurried downstairs, leaving Dan no choice but to wipe the cum off is own body and follow.
Going out the back door, Dan climbed over the low fence, while Ian backed up and the burst forward, leaping the 3 foot fence effortlessly. As Ian and Dan walked in Joe's back door, Dan's jaw dropped as he saw Joe, four-legged and smiling, waiting for them. He had only a towel wrapped around is front legs, and a pair of Umbro shorts on his rear. Ian and Joe looked at each other. "So it happened to you, too. What do you think's goin' on, Ian?"
Dan hurriedly pulled the crumpled up spell out of his pocket. He read it again, and realized he never specified the target of his centaur spell. Instead of making a full centaur out of one guy, the spells energy radiated out in every direction. How many boytaurs were there?