A Couple's Seductive Encounter with Their Gynecologist

The couple Snake Dave and his girlfriend have reason to celebrate: she's pregnant. They'd like to have an ultrasound, but they don't want to pay for it. The doctor, however, accepts payment in other ways, for example, by having the man share his blonde girlfriend with him. So, during the first examination, the couple ends up having a threesome with the doctor. Who would have thought the day could get any better?