your sister is in medical school and needs help with her very first physical exam test. she asks if you'll sub being her patient to practice on. you're nervous as this will involve taking your clothes off but sis convinces you, saying it will be very professional. she'll even wear a mask and gloves! you agree and head to her table to remove your clothes and sit while sis puts on her gloves. she begins the exam with your head and after a bit she notices you're getting a bit aroused.. she giggles and makes light of it then continues feeling you for the exam. next, she has you remove your underwear so she can do the most uncomfortable part: the testicle and penis exam. you're nervous but take them off. she begins investigating your balls, noting how full they feel. then it's on to the shaft where she notices you're already erect penis is growing harder. again she lightly teases you. then, she suggests you might as well help her practice getting a sperm sample. she has you stroke yourself while she grabs a cup. then, she notices your shy and not doing it quite right so she lowers her mask and offers you a hand. she gives you a handjob (off screen) and has you cum into the cup for the sample. she shows you how much you made and is impressed! finally, as you get dressed again, she notes how much she actually liked having you as a patient and hopes you can help her again soon. *DISCOUNT: included name Blair*