Ty noticed the scent from the opossum seemed to be growing stronger, and felt himself get an erection. On second thoughts, he didn't think he needed to wish for an animal to take his virginity when one had put itself in an easily accessible place. He sneaked out the back door, looked around to make sure no one was peeking, and approached the opossum.
As if scenting the horny teen's arousal, the opossum raised its back to Ty and flicked its tail aside, giving him a view of its moist folds. Ty knelt, undid his jeans and dropped his pants, allowing his erection to emerge, and rubbed his shaft along the opossum's slit. He couldn't believe what they were about to do, but reminded himself that this wasn't taboo anymore, not to mention how fucking good it was sure to feel.
He gasped and the animal yelped as his penis filled its tight vagina, and he balanced himself on his hands before slowly starting to thrust. It clenched warmly and tightly around him as he felt his hips motion instinctually in and out of the passage that so tightly gripped his phallus, the unnaturalness of their union weirdly making both of them seem to approach their peaks faster than they might if mating one of their own kind.
Soon the opossum yowled with satisfaction and its inner walls pulsed around Ty as it orgasmed, and in response Ty felt himself ejaculate, groaning shamelessly as he pumped his seed inside the animal. The two of them quickly became overcome with exhaustion, and Ty withdrew himself, his thick white cum leaking from the opossum's slit.
Inside its womb, Ty's sperm found not one or two, but scores of waiting eggs, and began to swarm around each of them. Soon each egg was fertilized and used to impregnate the opossum with a litter of offspring of Ty's.