Gundy had been searching for another participant for his next study. This study was a bit unusual, and he couldn’t divulge to the potential particip...nts what it involved. If they agreed to do the study, they would be under his control, and would be required to do whatever he asked. Dr. Gundy had received a number of interested responses, but so far no one fit what he had looking for. When Tina heard this, she immediately volunteered herself for the study. Dr. Gundy knew Tina would be a perfect. " He pressed his big dick against my hole and pushed in. I closed my eyes, wincing as he spread me wide and started to go in and out, deeper each time. "Damn you're tight," he whispered as my breathing became heavy. He kept going deeper until his pelvis hit mine, his balls bouncing on my ass cheeks. He wrapped his arms around my waist and picked me up to turn around and sit on the bench with me on his lap. "Ride me," he whispered as I grabbed his shoulders and started bouncing on his dick. It. I found her nipples with my forefinger and thumb. The pleasure on my penis increased as I pinched, twist, pulled, massage and caressed her stiff knobs. It wasn't long before her technique had me moaning in an animalistic growl. She join in with her heavenly moan as she fondled my jewel sack."Mmm ... mmm," she moaned in between releasing and engulfing my cock.My nuts began to tingle while her mouth worked its magic all over my cock. Her tongue massaged the under side of my prick, her teeth very. And some teased her about it which had her on the verge of tears until the end of the day.We would use it at various times from then on. My favorite was taking her to the edge of cumming at her house when she was talking to her parents. Her breathing would get shorter and her face redder and she would have to somehow excuse how she was looking to her parents. But she could not move away from them because I told her if she did, I would set it on max and then she would cum in front of them. So.