Another free video! And wow! This is hot - The twins are still working in same research lab, but this time they're greeted one day at work by Brad and Caleb, two of the lab's finest techs. So obviously this video has a lot to offer. But even better - The guys convince the twins that they're researching the mating habits of birds. Brad tells the twins that if the girls do sex stuff in front of the birds, they will start to mate. The twins begin to do loads of sexual response therapy in front of the birds that eventually lead to fucking Caleb. It's all the sex that you can handle this season, all in the name of science! What are you still doing reading this? Hit the link to jump past the break now!