There once was a brother and a sister, fraternal twins, who were approaching their high school graduation. It was getting near prom night and neither of them had a date for it. So one day, the girl approaches her brother and says Hey, you got a date for the prom yet?

He says No, why? You got someone lined up for me? You might say that. Why dont you take me to the prom?

Take you? You kidding? Youre my sister! Well, are you taking somebody else out?

You know I dont have a date, Sis. And neither do I. But we both want to go to the prom, dont we? Her brother nods. She continues, So we should go with each other.

The brother cant see anything wrong with her reasoning, so he tells his sister that if neither of them has a date by Wednesday evening he will take her to the prom. Wednesday evening rolls around. Neither of the siblings has a date, so the brother tells his sister that hell take her to the prom on Friday.

At the prom, both of them have a good time. The brother is glad that his sister talked him into taking her. Then, while hes standing at the punch bowl, his sister comes up to him again.

Hey, brother, lets dance.

He looks around to make sure that nobody heard her. Look, Sis, this is the Senior Prom, okay? Im not going to dance with my own sister at the prom, okay?

Dont be so shy. Look, Jimmy Elder is dancing with his cousin. So why cant you dance with your sister?

Oh . . . all right.

So they dance, a slow number. The rest of the prom passes by and after a while its over and time to go. Both of them have had a good time.

In the car, with the brother at the wheel, the sister looks over at him and says, Lets not go straight home.

He gives her a curious look and says, What are we going to do instead?

Oh, I dont know. Just drive around.

He agrees, and after they have driven around a while, out in the country, she looks over at him again and says Want to find some place to park?

Hell, he says, are you crazy? Youre my sister, Im not going parking with you!

Who said anything about going parking? Lets just pull over somewhere and talk for a while, okay? Its been a busy year for both of us– how long has it been since weve had a chance to talk to each other?

So she finally talks her brother into pulling the car over on a secluded back road, and after a few minutes of idle talk, she looks over at him again.

Hey . . . she says.

What?

Why dont you kiss me?

Youve been suggesting a lot of weird things lately, you know that? Im not going to kiss you, youre my sister! And he reached for the ignition switch to start the car.

She reached out and took his hand. I know Im your sister. Youve mentioned that a lot lately. And youre my brother. And dont we love each other? Why shouldnt we kiss if we feel like it? She kissed him on the cheek and he kissed her back. After a few minutes of kissing, she whispered in his ear, Come on. Lets do it.

Do what, said her brother, but he had a good idea of what his sister had in mind.

You know what, his sister replied.

I cant do that with you, youre my. . . His voice trailed off.

While he was on top of her, his sister murmured, You know, youre a lot lighter than Dad.

I know, said her brother. Mom told me.