Frank hunched forward his body swelling in bulk to meet the mass of muscle he would have when fully changed into a bull.
Snorting from the anxiety he felt seeing and likely in utter disbelief of what he felt. His maleness swelled, growing, protruding his shirt as buttons popped one after another.
His belt buckle flew near ten feet away as the belt burst, and blue jeans slpit their seams.
Grunting out his few words of wonder, "How, why, and what," he knew already the what, a bull, the how was beyond his comprehesion, but why, well April had the thought of toying someday with a real bull; and what better way to offer some safety than to use a fellow student as the bull.
Frank fell forward his arms changing to legs as hands became cloven hooves.
He began to bellow out his feelings, having the raw sensations known well to bulls, and rarely to human males.