So what's wrong with him having an erection? Encourage it! Make him stroke it every once in awhile whenever they notice that it's hard.

What would be REALLY cool is if the sisters showed him off that way to a girl that they knew he's secretly had a crush on, but was always afraid to approach. Poor boy. Naked, dripping, crying, and helplessly stroking. What a way to make an impression on the girl of your dreams. Some sisters can be soooo bad!

- Dr. Phil