Derrick finally gave in - he had wanted to be a minotaur. it was stupid to try backing out now that he was almost all the way there. Shifting behind the massive cow, he positioned his already-erect bullcock and thrust into the animal's hot, slick opening. The cow mooed and pushed back, and Derrick bellowed in surprised pleasure as he bottomed out against her rump. Instincts took over, and he grabbed the animal rump and began rocking in and out. He felt her clamp around his length, increasing the already intense pleasure, and his testicles swelled and churned. He felt himself swell out even larger, taller, heavier, and the link with the other Bulls was crystal clear. There was another presence as well, an overarching mind that hung like an umbrella over all the others. As Derrick came close to ejaculation, that new mind sent tendrils into his, probing deep into his thoughts and memories. He felt a faint glimmer of fear, awareness that the tendrils were changing him at some deep level, but mating was too overwhelming. Derrick thrust in again, deep and hard, and semen gushed into the cow as they bellowed in unison. He shuddered in release twice more, then staggered back. His glistening cock slid out and he stood there panting with deep breaths.
Bull slowly calmed, totally sated and content. There were memories of being a 15 year-old human named Derrick, but they were no stronger or more important than his memories of being a stock clerk, a soldier, a 5 year-old, or any of the other pasts he now shared with the rest of the minotaurs. He knew his duties, had memories of performing them for centuries, knew every other minotaur, and was completely happy being what he now was. The collective herd mind had accepted him and he was a minotaur, he was Bull.
The new Bull joined his companion Bull at the entrance to the cavern and they headed back to the Spa together. The new Bull was eager to get to work.