Your mother comes home from her job at the hospital and informs you that it's time for her to have a look over your balls and make sure everything's ok down there - you protest but she firmly tells you to stop being silly, there's no need to feel embarrassed. She makes you drop your trousers and examines your testicles, squeezing and checking them for lumps. She asks you some embarrassing questions about your masturbation habits, and then informs you that she's decided it would be a good idea to perform a virility test! She wants to make sure everything is running smoothly and so wants to see how easy you cum and how quickly you can cum again afterwards. You feel a bit awkward about this but she insists, and uses her hand to work your cock until you cum, talking sweetly to you the whole time. After you've cum she insists on further tests, this time using her mouth! She takes off her shirt to help you get hard and sucks your cock until you've cum once more. You're finding it difficult to get hard again after two orgasms so she strips off and bounces her ass for you until you're erect again, then rides your cock until you've cum for a third time. She asks you if you think you could still cum again and you tell her you're not sure but you think so, so she makes you fuck her doggystyle until you cum for a fourth time! Finally she's satisfied that you're healthy and virile and suggests you both take a shower together to clean off before she makes dinner..