experiment

1boy, completely nude, athletic, leather strap, bound, restrained, gagged, erection, penis milking, penis milking machine, strapped to a sex machine, test tube, laboratory, laboratory equipment, monitor, scientific experiment, test subject, being watched, being studied, 1girl, black hair, short hair, small breasts, lab coat, id card, doctor, clipboard, pen, taking notes, clothed female nude male, the girl is the doctor and watches how the boy is getting milked, she stands next to the boy and watches him, The sperm is suctioned out and flows into a test tube.