Bryan wandered, his original thoughts of working out a plan fading into a kind of dull complacence. The cud tasted good, the sun was warm on his back, and his nostrils were filled with pleasant odors. This wasn't so bad. Maybe a little dull, but even the boredom did not really register much. It was hard to think of why this was wrong at all. He wasn't exactly happy - more like content with himself and his surroundings. It was his animal brain, instincts and the simpler thoughts of a bull taking more control of his awareness. Was that a bad thing? Bryan had trouble shaking off the animal mindset. If anything, the bull was getting stronger - he felt very aroused now, the thick penis starting to slide out of his sheath, and the ponderous weight of his massive testicles joined by a sense of pressure, of desire.
Desire? Bryan struggled to identify the strange need that was growing in his mind, a very basic and primal need caused by strong scents in his nostrils. Females. Female in heat. Blinking, Bryan suddenly realized he had wandered close to the large herd of cows. Most had fairly neutral scents - pleasant to his bull's nostrils, but not exciting in any way. However, a couple of the cows were in heat, and one of them was shuffling in his direction. It seemed that she was feeling her own need, and recognized him as a way to fill that need.
A small part of Bryan's mind, the part that was hanging desperately on to his human identity, was very scared of the powerful instincts that boiled up in his animal mind. Although he was curious, the former human had no idea what actually mating with a cow would do to him. Maybe it would just be really nice. After all, he was completely a bull in body, and mounting cows was what a bull was supposed to do. But animal instincts and thoughts were already pretty strong, and Bryan was aware that his being a bull already felt almost normal to him. He liked being big and powerful and massive, the heavy muscles, his thick musk, the simple contentment and total freedom from responsibility and cares.
He pressed his moist nose into the cow's slick cunt, licking it to taste her juices. The act was purely instinctive, and part of him felt revulsion. His cock was hard now, swinging under his belly, and the need for the cow was beginning to overwhelm him. Bryan struggled against desire, animal instincts, the simple and pure lust that filled his mind. He wanted to give in, the experience raw animal sex, to find out what being a bull was really like. But would it extinguish everything that was left of his human identity? If he had any chance of stopping this, he had to act now. It was either force himself away, or take the literal plunge into mating as a beast.