You come into the doctor's office for your very first prostate exam. After the nurse checks your vitals, she invites you to lie on the examination table. The doctor comes in, puts on her gloves, and gently lubes up your ass before pressing in her fingers.
As she finishes, she comments on how hard you've gotten just from being fingered. Of course she'll need a sperm sample, and since you responded so well to her fingers, she'll be collecting this sample through an anal orgasm.
The doctor exposes her big dick, and the nurse kneels down to jerk her off. Once she's nice and hard, the nurse exposes her strap-on, and with doctor's permission, fucks you until you're ready for the doc's massive cock. The doctor takes over, fucking you with precision, her dick sliding deep into your ass. You feel yourself on the edge, and with one final thrust, the doctor cums inside you, her hot semen filling you up. Seems like you were the one collecting a sperm sample this time.