Suddenly Mikey watched as his babysitter took a step back. She squeezed the sides of her tank top and clenched her teeth.
"Mikey," she practically moaned, "do you know what 'horny' means?" She knew she couldn't do anything in front of Mikey, so with almost superhuman effort, she kept her hands well away from her nether regions. She clenched and unclenched her pelvic muscles in a vain attempt to help herself out.
"Not really," admitted Mikey. "Does it hurt you?"
Sheila said, "No, it doesn't hurt. I just need --" And then she had a brainstorm. "I need to go to the bathroom for a few minutes. I'm sure you can stay out of trouble, right? Okay, thanks." With that, she rushed upstairs -- Mikey was curious why she didn't just use the powder room that was right there off the main downstairs hallway.
Then he had a brainstorm of his own. Right there on the living room bookshelf was a dictionary. He gritted his teeth as he pulled the heavy book out of its place and lugged it to the nearby armchair, where he put it down on the seat. He flipped through until he got to the H's and found "horny." "Of or resembling horn; hard and rough," said the first definition, which confused Mikey because she hadn't turned into a rhinoceros or anything else with horns.
He found the second definition more interesting: "feeling or arousing sexual excitement." His mother had talked to him some about the birds and the bees, and he knew about "arousing" from his own experiences of being on the cusp of puberty and occasionally getting aroused -- including by the thought of transformations, as he'd figured out at school earlier. So he figured that Sheila really felt like having sex right now, and he wondered what he could do to help her using his transformation power over females.