"Hi! My name is Melissa," the girl says, a bit timidly, you notice.
"Howdy, I'm Brad. Pleased to meet you," you say, extending your hand, which she grasps. You notice a bit of color enter her cheeks as she looks you over, as you stand there naked except for your lightweight boxers.
"Am I a good enough piece of meat?" you venture, checking her out at the same time.
"What? Oh, yes, very," she manages. "You got some nice muscles, there."
"And you look like you'll be a beautiful birthday girl today," you say, going along.
"You really think so? Thank you," she says, her face truly pink now, and she breaks the silence that follows by reaching for the frosting bowl and plunging her hands into it.
You hear the garage door open and shut and you realize her mother has left, probably to go shopping. That leaves you and Melissa alone in the house...
The girl approaches you gingerly, hands covered in white frosting, as you stand there in front of her. You almost break out laughing at the strange sight, and she actually does herself.
"Come on, Melissa," you finally say. "Go ahead, this is going to be fun."
And then you realize what she's looking at, and follow her gaze down to your boxers, where your erect shaft has poked its way out of the vent. Now it's your turn to turn red, and you reach awkwardly down to fix it.