Open to a classroom.
On this particular day, two students on our row of interest were absent, so 2 students on the end were secluded from the others: a male and a female.
Our 2 main characters are Jemma (slightly below average height; long, straight, red hair) and Joe (skinny, somewhat tall, brown hair). Jemma is considered popular, unsurprising given how attractive she is. She is also quite smart compared to most girls. Joe was not popular. He was considered a nerd by all, which was obvious by his wiry frame and bad presentation.
Joe had always been attracted to Jemma, which was normal since she was so much out of his league, but something surprising was that Jemma was inexplicably attracted to Joe also. She could not explain it herself but there was something about him that drove her crazy. She was sometimes ashamed of it, but, when she was horny, she couldn't stop herself from fantasising about him.
Today was one of these times when she had no self-control. She had a plan which she had been plotting for months. Though she didn't want to, she knew she was going to act on it.
So, completely out of impulse, Jemma set her plot in motion. She slipped her small foot out of her shoe elegantly and rubbed it up Joe's leg, seductively. This instantly engorged Joe's above-average penis and caught his attention. He looked over at her with a questioning face. She winked and pointed to a small note discreetly. He waited a minute and then slid the note under the table. He looked at it briefly. It was folded three times. The first unfolding revealed a message saying that it should be read in private. This surprised (and aroused) Joe, but he respected Jemma and obeyed her wish. He slipped it into his pocket and thought about it for the remainder of the lesson.