Family Ties/You have to go with mom to the doctor for a checkup
You and your mom hop in the car and drive to the doctors office. You get out and check in and stuff. Your nurse, a young blonde around age 27, calls you back. After assessing your height and weight and blood pressure and stuff, you are about to go.
"All that's left is the testicular exam." She says. "Here, follow me." And you leave the room with your mom in it and follow the nurse into a separate room. She lays you down on the table as she pulls down your pants, revealing your underwear. She then hooks a finger into your waistband, and looks down your pants to see the goods. The reaches a gloved hand down there and the cool latex feels good on your little penis. She squeezes the shaft a bit, then moves down and cups the balls. She squeezes each one and massages your sack. She then pulls your pants off all the way and takes off your shirt until you are fully nude in front of her. She leans down and takes hold of your shaft.
Then, she moves her head closer to your penis. Maybe to get a closer look?