Transformative Struggle: Becoming a Canine

John had always been fascinated by science and technology. He spent most of his time in the lab, conducting experiments and pushing the boundaries of what was possible. One day, he stumbled upon a formula that promised to enhance human abilities beyond imagination. Without hesitation, he decided to test it on himself.

As John mixed the chemicals and prepared the serum, he couldn't contain his excitement. He injected himself with the formula and waited for the transformation to take place. However, things didn't go as planned. Instead of gaining superhuman abilities, John felt a strange sensation coursing through his body. His muscles began to bulge, his senses heightened, and his skin turned into fur. Within minutes, he was no longer human - he had become an anthro dog.

John couldn't believe what had happened. He looked down at his paws and let out a whine of frustration. But then, he felt something else - a primal desire that he couldn't ignore. His cock grew hard, throbbing with need. He knew he needed to relieve himself, but how?

As if on cue, a figure appeared in the lab. It was Sarah, John's assistant and long-time crush. She gasped when she saw him, but then, her eyes widened with lust. "John...you look incredible," she said, biting her lip.

John couldn't believe it. Here he was, turned into an anthro dog, and Sarah was looking at him like he was the sexiest thing she had ever seen. He wagged his tail, trying to communicate his desire.

Sarah seemed to understand. She walked over to John, her hips swaying seductively. She reached out and stroked his fur, making him moan with pleasure. "I've always wanted you, John," she whispered, her hand tracing down his chest and to his throbbing cock.

John couldn't hold back any longer. He pushed against Sarah, his cock sliding inside her wet pussy. She gasped, throwing her head back in ecstasy. They moved together, their bodies becoming one as they explored each other's desires.

"Fuck me harder, John," Sarah moaned, her nails digging into his fur. John complied, pounding into her with all his strength. He could feel himself getting closer and closer to climax, but he didn't want it to end.

"I'm going to cum," he growled, his hips bucking wildly. Sarah wrapped her legs around him, pulling him deeper inside her. She came with a cry, her walls clenching around him as he released his load.

They collapsed onto the floor, panting and sweaty. John looked at Sarah, his heart racing. "I never knew being an anthro dog could be so hot," he said, grinning.

Sarah chuckled, running her fingers through his fur. "Neither did I," she said, smiling back at him. "But I have a feeling we're going to have a lot of fun exploring this new side of you."

And with that, they continued their erotic exploration, discovering new pleasures and desires as an anthro dog and his willing partner.