It was another mouse, with bright white fur and ruby red eyes. It, or rather he, judging by the enormous testicles swaying below the mouse's body, was sniffing the air. Julia was confused. He was surrounded by food, why was he sniffing like he was searching for something? Perhaps he was looking for a specific food?
The mouse turned his red gaze on Julia. Julia's heart dropped. He was sniffing out a special treat all right. That special treat being her.
Julia turned around to scamper away, but the other mouse was bigger and faster. He caught up to her in a matter of seconds. Gripping her body, he climbed on top of her, his gigantic balls pressing against her rear. Julia frantically squeaked, clawed, and squirmed to no avail. The other mouse clearly knew what he was doing. He thrust his penis into Julia's brand new vagina, making her squeak. He began to hump frantically, desperately. All Julia could do was take it and wait for it to be over.
After what felt like hours but was certainly mere minutes, the other mouse shot his seed into Julia and dismounted. While Julia lay there, trying to come to terms with what had happened, the other mouse did something that surprised her.