Supervised Medical Masturbation

You have a follow-up appointment with your doctor and when she comes in, you can't help but notice her amazing breasts nearly spilling out of her coat. She explains that to further address your little "issue" down there, she needs a larger sample of semen. But because she suspects your problem may be the way you masturbate, she is going to supervise and instruct you from start to finish. Go ahead and undress, she says. I'm your doctor and I know you've had a thing for me for quite some time.