You know, accidental touches on my left leg or arm.I got so horny, I moved my cock a several times with my hand so she could see I do it, or moved it ...with the cock-muscles - and she observed and saw it.I stood up, and walked by her a couple of times, with my front and half erected cock to her - max 20-30 cm from her face, and she see my cock moving under the shorts.But I think the most exciting part, was the moment after she fall in sleep. I massage my full erected and hard cock outside my. She teased that if she knew I had any left in me she’d have taken it herself.We talked more after breakfast. She had an idea for the required class project and would I be willing to be a subject. Since the idea was to look at the physical and mental conditioning benefits of regular sex, who would say no. I was to go to the department office Monday morning and have some baseline measurements taken for comparison with later.Also, since more than one subject would be better, did I know any older. You bite your lip as you sit up on your elbows. At this point you can no longer take it. You reach over and grab him and find his now massive erection. So hard and strong, like his hands. You rub it through his pants as he massages you and strokes his fingers in you. You start breathing faster, and harder at all the sensations you lift your hips allowing his fingers to go deeper into you. Ahhhh you feel. And you grip his cock hard as you orgasm. Your pussy clamps around his fingers and you. I was not going back to the room I had been kept in for so many weeks but to a much nicer room.The room was furnished like a bedroom, with curtains, chairs, dressing table, wardrobe, even a TV and tea/coffee making facilities. The room also had its own en-suite bathroom and a window that I was able to see out of.I looked out of the window and could see the grounds of the clinic. The view was quite surprising as it consisted of well kept gardens. The clinic was quite clearly out in the country.