Mrs. Robinson theorized that her body was adapting to me, learning how to become immune to my effect. We just weren't sure how to prove it, or know the exact cause itself. After a few chemical tests and practical experiments, we finally found our answer.Mrs. Robinson blew me to the brink of orgasm, then jerked me off into a glass. Then, with practiced scientific detachment, she added several droplets of my spunk to a group of the beakers filled with her female synthetic. The next time I got horny, we measured the chemical reaction. The group that had my sperm added reacted slightly less.Several blowjobs later, with Gabrielle's help as well, we found that my sperm had a cumulative effect that was proportional to the reduction in arousal. Basically, the more spunk I put into a girl in a short period of time, the less she would be affected by me.We even ran a control test on poor Gabrielle. She was able to spend a lot of time around me, but for two weeks was unable to have any physical. She asked me what I was thinking about while I was doing it, I answered that I was thinking about her pussy before when she was peeing. She started to touch herself and she now spoke with a weak and trembling voice. She told me if I wasn't ashamed to show her my cock so hard in a shameful act like that. My cock grew bigger and harder if possible. She told me that how she enjoyed to touch herself in front of me, and then she came closer to watch. Her face was close to the tip of my cock as she admired every detail of my hand rubbing the big red head that was throbbing greatly. When she told me that she was coming I ejaculated a huge squirt of cum that hit her face. She took two other spurts before she had the time to rise her head. She came violently agains me, she was so wet of piss and pussy fluids that I had my leg soaked. She had two big lines of cum running on her face and she took a small amount with her finger and tasted it. She told me that she was very curious of what flavor.
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