Gym trainer smells his client's sexy feet and stinky socks

Jack is working as personal trainer and usually nice young girls and guys are using his services. He has his own small personal gym and quite a good base of customers. Right now he is in the middle of a lesson with this pretty young girl and Jack is convinced her feet must be great! Her hands are and usually these two goes hand in hand. Or maybe rather hand in feet..? :) Anyway Jack is using every opportunity to smell her feet. He even takes of her shoes under some pretense and now he has her feet only in socks. And the smell of her gym feet is magnificent! He can't get enough but the girl is not stupid and she knows something is up. But this one doesn't punish around the bush and asks Jack directly: