Jeff started to slowly stand up, trying not to upset the creature that was now standing on his window sill. She seemed to watch him with some interest, sniffing the air of the room. Suddenly, his mother's eyes dilated, and she focused directly on Jeff. Or, more specifically, his crotch.
Now entering the room fully, Jeff's former mother quickly crossed the space between the two, and tackled the boy to the ground.
"Whelp, this is it," Jeff thought, "I changed my mother into a monster, and now she's going to kill me." Jeff closed his eyes, and waited for the end.
Irene curled her upper arms around the boy's shoulders, quietly chittering to herself. She knew that this thing smelled like a male, something she desperately needed right now, but she couldn't figure out where his maleness was. Frustrated, she began rubbing her breasts over the male, hoping he would get the message.
Jeff stiffen when he felt his mother's breasts rub against his chest. Heat flooded his cheeks, and his pant's began to tent. Sure, the thing on top of him was previously his mother, but it had just experienced several million years of evolution, it was as far removed from him as a dog. And sure, it looked kinda freaky, but for some reason Jeff found it incredibly hot regardless. His mind made up, Jeff sat up as far as he could and started licking the creature's second set of nipples.
Irene was ecstatic. The male had responded positively to her begging. However, he still hadn't shown her where he was keeping his maleness. That when she saw it. The material around his crotch, the place that smelled the most male, had shifted. With her lower set of claws, Irene tore off the male's pants and let his manhood hang loose. With a triumphant hiss, Irene picked the male up and fell onto her back, with Jeff on top of her, his maleness lined straight up with her femininity.
Jeff waited no time, and started thrusting into her snatch. The beast moaned lewdly, almost sounding like the woman she once was. As he kept thrusting, Jeff once again went to town on Irene's breasts, licking around the areola, before latching onto her nipples and sucking. Jeff was duly surprised when he tasted a sweet liquid in his mouth, before relishing in the milk's taste. It was so good! Like nothing he ever had before. The female beneath him started squirming under his oral affection, and Jeff knew what he had to do. Quickening the pace of his thrusts, Jeff started milking his mother for all she had, not noticing the changes happening to his own body.