The movie kicks off with a scene where the two sisters are watching a cowboy movie on TV in their pajamas.
Both sisters mimic the cowboy scene on TV by sitting on pillows and pretending their pillow is a horse, which one sister ends up using as a masturbation tool.
They are clothed during this activity, but the one sister has a sexual awakening during the scene while her sister looks on, bewildered.
Their mother is called in after the young girl is sitting in the fetal position.